/** !
 * Sortable 1.14.0
 * @author	RubaXa   <trash@rubaxa.org>
 * @author	owenm    <owen23355@gmail.com>
 * @license MIT
 */
function ownKeys (object, enumerableOnly) {
    var keys = Object.keys(object);

    if (Object.getOwnPropertySymbols) {
        var symbols = Object.getOwnPropertySymbols(object);

        if (enumerableOnly) {
            symbols = symbols.filter(function (sym) {
                return Object.getOwnPropertyDescriptor(object, sym).enumerable;
            });
        }

        keys.push.apply(keys, symbols);
    }

    return keys;
}

function _objectSpread2 (target) {
    for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i] != null ? arguments[i] : {};

        if (i % 2) {
            ownKeys(Object(source), true).forEach(function (key) {
                _defineProperty(target, key, source[key]);
            });
        } else if (Object.getOwnPropertyDescriptors) {
            Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
        } else {
            ownKeys(Object(source)).forEach(function (key) {
                Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
            });
        }
    }

    return target;
}

function _typeof (obj) {
    '@babel/helpers - typeof';

    if (typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol') {
        _typeof = function (obj) {
            return typeof obj;
        };
    } else {
        _typeof = function (obj) {
            return obj && typeof Symbol === 'function' && obj.constructor === Symbol && obj !== Symbol.prototype ? 'symbol' : typeof obj;
        };
    }

    return _typeof(obj);
}

function _defineProperty (obj, key, value) {
    if (key in obj) {
        Object.defineProperty(obj, key, {
            value: value,
            enumerable: true,
            configurable: true,
            writable: true
        });
    } else {
        obj[key] = value;
    }

    return obj;
}

function _extends () {
    _extends = Object.assign || function (target) {
        for (var i = 1; i < arguments.length; i++) {
            var source = arguments[i];

            for (var key in source) {
                if (Object.prototype.hasOwnProperty.call(source, key)) {
                    target[key] = source[key];
                }
            }
        }

        return target;
    };

    return _extends.apply(this, arguments);
}

function _objectWithoutPropertiesLoose (source, excluded) {
    if (source == null) { return {}; }
    var target = {};
    var sourceKeys = Object.keys(source);
    var key, i;

    for (i = 0; i < sourceKeys.length; i++) {
        key = sourceKeys[i];
        if (excluded.indexOf(key) >= 0) { continue; }
        target[key] = source[key];
    }

    return target;
}

function _objectWithoutProperties (source, excluded) {
    if (source == null) { return {}; }

    var target = _objectWithoutPropertiesLoose(source, excluded);

    var key, i;

    if (Object.getOwnPropertySymbols) {
        var sourceSymbolKeys = Object.getOwnPropertySymbols(source);

        for (i = 0; i < sourceSymbolKeys.length; i++) {
            key = sourceSymbolKeys[i];
            if (excluded.indexOf(key) >= 0) { continue; }
            if (!Object.prototype.propertyIsEnumerable.call(source, key)) { continue; }
            target[key] = source[key];
        }
    }

    return target;
}

function _toConsumableArray (arr) {
    return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread();
}

function _arrayWithoutHoles (arr) {
    if (Array.isArray(arr)) { return _arrayLikeToArray(arr); }
}

function _iterableToArray (iter) {
    if (typeof Symbol !== 'undefined' && iter[Symbol.iterator] != null || iter['@@iterator'] != null) { return Array.from(iter); }
}

function _unsupportedIterableToArray (o, minLen) {
    if (!o) { return; }
    if (typeof o === 'string') { return _arrayLikeToArray(o, minLen); }
    var n = Object.prototype.toString.call(o).slice(8, -1);
    if (n === 'Object' && o.constructor) { n = o.constructor.name; }
    if (n === 'Map' || n === 'Set') { return Array.from(o); }
    if (n === 'Arguments' || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) { return _arrayLikeToArray(o, minLen); }
}

function _arrayLikeToArray (arr, len) {
    if (len == null || len > arr.length) { len = arr.length; }

    for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; }

    return arr2;
}

function _nonIterableSpread () {
    throw new TypeError('Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.');
}

var version = '1.14.0';

function userAgent (pattern) {
    if (typeof window !== 'undefined' && window.navigator) {
        return !!navigator.userAgent.match(pattern);
    }
}

var IE11OrLess = userAgent(/(?:Trident.*rv[ :]?11\.|msie|iemobile|Windows Phone)/i);
var Edge = userAgent(/Edge/i);
var FireFox = userAgent(/firefox/i);
var Safari = userAgent(/safari/i) && !userAgent(/chrome/i) && !userAgent(/android/i);
var IOS = userAgent(/iP(ad|od|hone)/i);
var ChromeForAndroid = userAgent(/chrome/i) && userAgent(/android/i);

var captureMode = {
    capture: false,
    passive: false
};

function on (el, event, fn) {
    el.addEventListener(event, fn, !IE11OrLess && captureMode);
}

function off (el, event, fn) {
    el.removeEventListener(event, fn, !IE11OrLess && captureMode);
}

function matches (
    /** HTMLElement */
    el,
    /** String */
    selector) {
    if (!selector) { return; }
    selector[0] === '>' && (selector = selector.substring(1));

    if (el) {
        try {
            if (el.matches) {
                return el.matches(selector);
            } else if (el.msMatchesSelector) {
                return el.msMatchesSelector(selector);
            } else if (el.webkitMatchesSelector) {
                return el.webkitMatchesSelector(selector);
            }
        } catch (_) {
            return false;
        }
    }

    return false;
}

function getParentOrHost (el) {
    return el.host && el !== document && el.host.nodeType ? el.host : el.parentNode;
}

function closest (
    /** HTMLElement */
    el,
    /** String */
    selector,
    /** HTMLElement */
    ctx, includeCTX) {
    if (el) {
        ctx = ctx || document;

        do {
            if (selector != null && (selector[0] === '>' ? el.parentNode === ctx && matches(el, selector) : matches(el, selector)) || includeCTX && el === ctx) {
                return el;
            }

            if (el === ctx) { break; }
            /* jshint boss:true */
        } while (el = getParentOrHost(el));
    }

    return null;
}

var R_SPACE = /\s+/g;

function toggleClass (el, name, state) {
    if (el && name) {
        if (el.classList) {
            el.classList[state ? 'add' : 'remove'](name);
        } else {
            var className = (' ' + el.className + ' ').replace(R_SPACE, ' ').replace(' ' + name + ' ', ' ');
            el.className = (className + (state ? ' ' + name : '')).replace(R_SPACE, ' ');
        }
    }
}

function css (el, prop, val) {
    var style = el && el.style;

    if (style) {
        if (val === void 0) {
            if (document.defaultView && document.defaultView.getComputedStyle) {
                val = document.defaultView.getComputedStyle(el, '');
            } else if (el.currentStyle) {
                val = el.currentStyle;
            }

            return prop === void 0 ? val : val[prop];
        } else {
            if (!(prop in style) && prop.indexOf('webkit') === -1) {
                prop = '-webkit-' + prop;
            }

            style[prop] = val + (typeof val === 'string' ? '' : 'px');
        }
    }
}

function matrix (el, selfOnly) {
    var appliedTransforms = '';

    if (typeof el === 'string') {
        appliedTransforms = el;
    } else {
        do {
            var transform = css(el, 'transform');

            if (transform && transform !== 'none') {
                appliedTransforms = transform + ' ' + appliedTransforms;
            }
            /* jshint boss:true */
        } while (!selfOnly && (el = el.parentNode));
    }

    var matrixFn = window.DOMMatrix || window.WebKitCSSMatrix || window.CSSMatrix || window.MSCSSMatrix;
    /* jshint -W056 */

    return matrixFn && new matrixFn(appliedTransforms);
}

function find (ctx, tagName, iterator) {
    if (ctx) {
        var list = ctx.getElementsByTagName(tagName);
        var i = 0;
        var n = list.length;

        if (iterator) {
            for (; i < n; i++) {
                iterator(list[i], i);
            }
        }

        return list;
    }

    return [];
}

function getWindowScrollingElement () {
    var scrollingElement = document.scrollingElement;

    if (scrollingElement) {
        return scrollingElement;
    } else {
        return document.documentElement;
    }
}
/**
 * Returns the "bounding client rect" of given element
 * @param  {HTMLElement} el                       The element whose boundingClientRect is wanted
 * @param  {[Boolean]} relativeToContainingBlock  Whether the rect should be relative to the containing block of (including) the container
 * @param  {[Boolean]} relativeToNonStaticParent  Whether the rect should be relative to the relative parent of (including) the contaienr
 * @param  {[Boolean]} undoScale                  Whether the container's scale() should be undone
 * @param  {[HTMLElement]} container              The parent the element will be placed in
 * @return {Object}                               The boundingClientRect of el, with specified adjustments
 */

function getRect (el, relativeToContainingBlock, relativeToNonStaticParent, undoScale, container) {
    if (!el.getBoundingClientRect && el !== window) { return; }
    var elRect, top, left, bottom, right, height, width;

    if (el !== window && el.parentNode && el !== getWindowScrollingElement()) {
        elRect = el.getBoundingClientRect();
        top = elRect.top;
        left = elRect.left;
        bottom = elRect.bottom;
        right = elRect.right;
        height = elRect.height;
        width = elRect.width;
    } else {
        top = 0;
        left = 0;
        bottom = window.innerHeight;
        right = window.innerWidth;
        height = window.innerHeight;
        width = window.innerWidth;
    }

    if ((relativeToContainingBlock || relativeToNonStaticParent) && el !== window) {
        // Adjust for translate()
        container = container || el.parentNode; // solves #1123 (see: https://stackoverflow.com/a/37953806/6088312)
        // Not needed on <= IE11

        if (!IE11OrLess) {
            do {
                if (container && container.getBoundingClientRect && (css(container, 'transform') !== 'none' || relativeToNonStaticParent && css(container, 'position') !== 'static')) {
                    var containerRect = container.getBoundingClientRect(); // Set relative to edges of padding box of container

                    top -= containerRect.top + parseInt(css(container, 'border-top-width'));
                    left -= containerRect.left + parseInt(css(container, 'border-left-width'));
                    bottom = top + elRect.height;
                    right = left + elRect.width;
                    break;
                }
                /* jshint boss:true */
            } while (container = container.parentNode);
        }
    }

    if (undoScale && el !== window) {
        // Adjust for scale()
        var elMatrix = matrix(container || el);
        var scaleX = elMatrix && elMatrix.a;
        var scaleY = elMatrix && elMatrix.d;

        if (elMatrix) {
            top /= scaleY;
            left /= scaleX;
            width /= scaleX;
            height /= scaleY;
            bottom = top + height;
            right = left + width;
        }
    }

    return {
        top: top,
        left: left,
        bottom: bottom,
        right: right,
        width: width,
        height: height
    };
}
/**
 * Checks if a side of an element is scrolled past a side of its parents
 * @param  {HTMLElement}  el           The element who's side being scrolled out of view is in question
 * @param  {String}       elSide       Side of the element in question ('top', 'left', 'right', 'bottom')
 * @param  {String}       parentSide   Side of the parent in question ('top', 'left', 'right', 'bottom')
 * @return {HTMLElement}               The parent scroll element that the el's side is scrolled past, or null if there is no such element
 */

function isScrolledPast (el, elSide, parentSide) {
    var parent = getParentAutoScrollElement(el, true);
    var elSideVal = getRect(el)[elSide];
    /* jshint boss:true */

    while (parent) {
        var parentSideVal = getRect(parent)[parentSide];
        var visible = void 0;

        if (parentSide === 'top' || parentSide === 'left') {
            visible = elSideVal >= parentSideVal;
        } else {
            visible = elSideVal <= parentSideVal;
        }

        if (!visible) { return parent; }
        if (parent === getWindowScrollingElement()) { break; }
        parent = getParentAutoScrollElement(parent, false);
    }

    return false;
}
/**
 * Gets nth child of el, ignoring hidden children, sortable's elements (does not ignore clone if it's visible)
 * and non-draggable elements
 * @param  {HTMLElement} el       The parent element
 * @param  {Number} childNum      The index of the child
 * @param  {Object} options       Parent Sortable's options
 * @return {HTMLElement}          The child at index childNum, or null if not found
 */

function getChild (el, childNum, options, includeDragEl) {
    var currentChild = 0;
    var i = 0;
    var children = el.children;

    while (i < children.length) {
        if (children[i].style.display !== 'none' && children[i] !== Sortable.ghost && (includeDragEl || children[i] !== Sortable.dragged) && closest(children[i], options.draggable, el, false)) {
            if (currentChild === childNum) {
                return children[i];
            }

            currentChild++;
        }

        i++;
    }

    return null;
}
/**
 * Gets the last child in the el, ignoring ghostEl or invisible elements (clones)
 * @param  {HTMLElement} el       Parent element
 * @param  {selector} selector    Any other elements that should be ignored
 * @return {HTMLElement}          The last child, ignoring ghostEl
 */

function lastChild (el, selector) {
    var last = el.lastElementChild;

    while (last && (last === Sortable.ghost || css(last, 'display') === 'none' || selector && !matches(last, selector))) {
        last = last.previousElementSibling;
    }

    return last || null;
}
/**
 * Returns the index of an element within its parent for a selected set of
 * elements
 * @param  {HTMLElement} el
 * @param  {selector} selector
 * @return {number}
 */

function index (el, selector) {
    var index = 0;

    if (!el || !el.parentNode) {
        return -1;
    }
    /* jshint boss:true */

    while (el = el.previousElementSibling) {
        if (el.nodeName.toUpperCase() !== 'TEMPLATE' && el !== Sortable.clone && (!selector || matches(el, selector))) {
            index++;
        }
    }

    return index;
}
/**
 * Returns the scroll offset of the given element, added with all the scroll offsets of parent elements.
 * The value is returned in real pixels.
 * @param  {HTMLElement} el
 * @return {Array}             Offsets in the format of [left, top]
 */

function getRelativeScrollOffset (el) {
    var offsetLeft = 0;
    var offsetTop = 0;
    var winScroller = getWindowScrollingElement();

    if (el) {
        do {
            var elMatrix = matrix(el);
            var scaleX = elMatrix.a;
            var scaleY = elMatrix.d;
            offsetLeft += el.scrollLeft * scaleX;
            offsetTop += el.scrollTop * scaleY;
        } while (el !== winScroller && (el = el.parentNode));
    }

    return [offsetLeft, offsetTop];
}
/**
 * Returns the index of the object within the given array
 * @param  {Array} arr   Array that may or may not hold the object
 * @param  {Object} obj  An object that has a key-value pair unique to and identical to a key-value pair in the object you want to find
 * @return {Number}      The index of the object in the array, or -1
 */

function indexOfObject (arr, obj) {
    for (var i in arr) {
        if (!arr.hasOwnProperty(i)) { continue; }

        for (var key in obj) {
            if (obj.hasOwnProperty(key) && obj[key] === arr[i][key]) { return Number(i); }
        }
    }

    return -1;
}

function getParentAutoScrollElement (el, includeSelf) {
    // skip to window
    if (!el || !el.getBoundingClientRect) { return getWindowScrollingElement(); }
    var elem = el;
    var gotSelf = false;

    do {
        // we don't need to get elem css if it isn't even overflowing in the first place (performance)
        if (elem.clientWidth < elem.scrollWidth || elem.clientHeight < elem.scrollHeight) {
            var elemCSS = css(elem);

            if (elem.clientWidth < elem.scrollWidth && (elemCSS.overflowX == 'auto' || elemCSS.overflowX == 'scroll') || elem.clientHeight < elem.scrollHeight && (elemCSS.overflowY == 'auto' || elemCSS.overflowY == 'scroll')) {
                if (!elem.getBoundingClientRect || elem === document.body) { return getWindowScrollingElement(); }
                if (gotSelf || includeSelf) { return elem; }
                gotSelf = true;
            }
        }
        /* jshint boss:true */
    } while (elem = elem.parentNode);

    return getWindowScrollingElement();
}

function extend (dst, src) {
    if (dst && src) {
        for (var key in src) {
            if (src.hasOwnProperty(key)) {
                dst[key] = src[key];
            }
        }
    }

    return dst;
}

function isRectEqual (rect1, rect2) {
    return Math.round(rect1.top) === Math.round(rect2.top) && Math.round(rect1.left) === Math.round(rect2.left) && Math.round(rect1.height) === Math.round(rect2.height) && Math.round(rect1.width) === Math.round(rect2.width);
}

var _throttleTimeout;

function throttle (callback, ms) {
    return function () {
        if (!_throttleTimeout) {
            var args = arguments;
            var _this = this;

            if (args.length === 1) {
                callback.call(_this, args[0]);
            } else {
                callback.apply(_this, args);
            }

            _throttleTimeout = setTimeout(function () {
                _throttleTimeout = void 0;
            }, ms);
        }
    };
}

function cancelThrottle () {
    clearTimeout(_throttleTimeout);
    _throttleTimeout = void 0;
}

function scrollBy (el, x, y) {
    el.scrollLeft += x;
    el.scrollTop += y;
}

function clone (el) {
    var Polymer = window.Polymer;
    var $ = window.jQuery || window.Zepto;

    if (Polymer && Polymer.dom) {
        return Polymer.dom(el).cloneNode(true);
    } else if ($) {
        return $(el).clone(true)[0];
    } else {
        return el.cloneNode(true);
    }
}

function setRect (el, rect) {
    css(el, 'position', 'absolute');
    css(el, 'top', rect.top);
    css(el, 'left', rect.left);
    css(el, 'width', rect.width);
    css(el, 'height', rect.height);
}

function unsetRect (el) {
    css(el, 'position', '');
    css(el, 'top', '');
    css(el, 'left', '');
    css(el, 'width', '');
    css(el, 'height', '');
}

var expando = 'Sortable' + new Date().getTime();

function AnimationStateManager () {
    var animationStates = [];
    var animationCallbackId;
    return {
        captureAnimationState: function captureAnimationState () {
            animationStates = [];
            if (!this.options.animation) { return; }
            var children = [].slice.call(this.el.children);
            children.forEach(function (child) {
                if (css(child, 'display') === 'none' || child === Sortable.ghost) { return; }
                animationStates.push({
                    target: child,
                    rect: getRect(child)
                });

                var fromRect = _objectSpread2({}, animationStates[animationStates.length - 1].rect); // If animating: compensate for current animation

                if (child.thisAnimationDuration) {
                    var childMatrix = matrix(child, true);

                    if (childMatrix) {
                        fromRect.top -= childMatrix.f;
                        fromRect.left -= childMatrix.e;
                    }
                }

                child.fromRect = fromRect;
            });
        },
        addAnimationState: function addAnimationState (state) {
            animationStates.push(state);
        },
        removeAnimationState: function removeAnimationState (target) {
            animationStates.splice(indexOfObject(animationStates, {
                target: target
            }), 1);
        },
        animateAll: function animateAll (callback) {
            var _this = this;

            if (!this.options.animation) {
                clearTimeout(animationCallbackId);
                if (typeof callback === 'function') { callback(); }
                return;
            }

            var animating = false;
            var animationTime = 0;
            animationStates.forEach(function (state) {
                var time = 0;
                var target = state.target;
                var fromRect = target.fromRect;
                var toRect = getRect(target);
                var prevFromRect = target.prevFromRect;
                var prevToRect = target.prevToRect;
                var animatingRect = state.rect;
                var targetMatrix = matrix(target, true);

                if (targetMatrix) {
                    // Compensate for current animation
                    toRect.top -= targetMatrix.f;
                    toRect.left -= targetMatrix.e;
                }

                target.toRect = toRect;

                if (target.thisAnimationDuration) {
                    // Could also check if animatingRect is between fromRect and toRect
                    if (isRectEqual(prevFromRect, toRect) && !isRectEqual(fromRect, toRect) && // Make sure animatingRect is on line between toRect & fromRect
                        (animatingRect.top - toRect.top) / (animatingRect.left - toRect.left) === (fromRect.top - toRect.top) / (fromRect.left - toRect.left)) {
                        // If returning to same place as started from animation and on same axis
                        time = calculateRealTime(animatingRect, prevFromRect, prevToRect, _this.options);
                    }
                } // if fromRect != toRect: animate

                if (!isRectEqual(toRect, fromRect)) {
                    target.prevFromRect = fromRect;
                    target.prevToRect = toRect;

                    if (!time) {
                        time = _this.options.animation;
                    }

                    _this.animate(target, animatingRect, toRect, time);
                }

                if (time) {
                    animating = true;
                    animationTime = Math.max(animationTime, time);
                    clearTimeout(target.animationResetTimer);
                    target.animationResetTimer = setTimeout(function () {
                        target.animationTime = 0;
                        target.prevFromRect = null;
                        target.fromRect = null;
                        target.prevToRect = null;
                        target.thisAnimationDuration = null;
                    }, time);
                    target.thisAnimationDuration = time;
                }
            });
            clearTimeout(animationCallbackId);

            if (!animating) {
                if (typeof callback === 'function') { callback(); }
            } else {
                animationCallbackId = setTimeout(function () {
                    if (typeof callback === 'function') { callback(); }
                }, animationTime);
            }

            animationStates = [];
        },
        animate: function animate (target, currentRect, toRect, duration) {
            if (duration) {
                css(target, 'transition', '');
                css(target, 'transform', '');
                var elMatrix = matrix(this.el);
                var scaleX = elMatrix && elMatrix.a;
                var scaleY = elMatrix && elMatrix.d;
                var translateX = (currentRect.left - toRect.left) / (scaleX || 1);
                var translateY = (currentRect.top - toRect.top) / (scaleY || 1);
                target.animatingX = !!translateX;
                target.animatingY = !!translateY;
                css(target, 'transform', 'translate3d(' + translateX + 'px,' + translateY + 'px,0)');
                this.forRepaintDummy = repaint(target); // repaint

                css(target, 'transition', 'transform ' + duration + 'ms' + (this.options.easing ? ' ' + this.options.easing : ''));
                css(target, 'transform', 'translate3d(0,0,0)');
                typeof target.animated === 'number' && clearTimeout(target.animated);
                target.animated = setTimeout(function () {
                    css(target, 'transition', '');
                    css(target, 'transform', '');
                    target.animated = false;
                    target.animatingX = false;
                    target.animatingY = false;
                }, duration);
            }
        }
    };
}

function repaint (target) {
    return target.offsetWidth;
}

function calculateRealTime (animatingRect, fromRect, toRect, options) {
    return Math.sqrt(Math.pow(fromRect.top - animatingRect.top, 2) + Math.pow(fromRect.left - animatingRect.left, 2)) / Math.sqrt(Math.pow(fromRect.top - toRect.top, 2) + Math.pow(fromRect.left - toRect.left, 2)) * options.animation;
}

var plugins = [];
var defaults = {
    initializeByDefault: true
};
var PluginManager = {
    mount: function mount (plugin) {
        // Set default static properties
        for (var option in defaults) {
            if (defaults.hasOwnProperty(option) && !(option in plugin)) {
                plugin[option] = defaults[option];
            }
        }

        plugins.forEach(function (p) {
            if (p.pluginName === plugin.pluginName) {
                throw 'Sortable: Cannot mount plugin '.concat(plugin.pluginName, ' more than once');
            }
        });
        plugins.push(plugin);
    },
    pluginEvent: function pluginEvent (eventName, sortable, evt) {
        var _this = this;

        this.eventCanceled = false;

        evt.cancel = function () {
            _this.eventCanceled = true;
        };

        var eventNameGlobal = eventName + 'Global';
        plugins.forEach(function (plugin) {
            if (!sortable[plugin.pluginName]) { return; } // Fire global events if it exists in this sortable

            if (sortable[plugin.pluginName][eventNameGlobal]) {
                sortable[plugin.pluginName][eventNameGlobal](_objectSpread2({
                    sortable: sortable
                }, evt));
            } // Only fire plugin event if plugin is enabled in this sortable,
            // and plugin has event defined

            if (sortable.options[plugin.pluginName] && sortable[plugin.pluginName][eventName]) {
                sortable[plugin.pluginName][eventName](_objectSpread2({
                    sortable: sortable
                }, evt));
            }
        });
    },
    initializePlugins: function initializePlugins (sortable, el, defaults, options) {
        plugins.forEach(function (plugin) {
            var pluginName = plugin.pluginName;
            if (!sortable.options[pluginName] && !plugin.initializeByDefault) { return; }
            var initialized = new plugin(sortable, el, sortable.options);
            initialized.sortable = sortable;
            initialized.options = sortable.options;
            sortable[pluginName] = initialized; // Add default options from plugin

            _extends(defaults, initialized.defaults);
        });

        for (var option in sortable.options) {
            if (!sortable.options.hasOwnProperty(option)) { continue; }
            var modified = this.modifyOption(sortable, option, sortable.options[option]);

            if (typeof modified !== 'undefined') {
                sortable.options[option] = modified;
            }
        }
    },
    getEventProperties: function getEventProperties (name, sortable) {
        var eventProperties = {};
        plugins.forEach(function (plugin) {
            if (typeof plugin.eventProperties !== 'function') { return; }

            _extends(eventProperties, plugin.eventProperties.call(sortable[plugin.pluginName], name));
        });
        return eventProperties;
    },
    modifyOption: function modifyOption (sortable, name, value) {
        var modifiedValue;
        plugins.forEach(function (plugin) {
            // Plugin must exist on the Sortable
            if (!sortable[plugin.pluginName]) { return; } // If static option listener exists for this option, call in the context of the Sortable's instance of this plugin

            if (plugin.optionListeners && typeof plugin.optionListeners[name] === 'function') {
                modifiedValue = plugin.optionListeners[name].call(sortable[plugin.pluginName], value);
            }
        });
        return modifiedValue;
    }
};

function dispatchEvent (_ref) {
    var sortable = _ref.sortable;
    var rootEl = _ref.rootEl;
    var name = _ref.name;
    var targetEl = _ref.targetEl;
    var cloneEl = _ref.cloneEl;
    var toEl = _ref.toEl;
    var fromEl = _ref.fromEl;
    var oldIndex = _ref.oldIndex;
    var newIndex = _ref.newIndex;
    var oldDraggableIndex = _ref.oldDraggableIndex;
    var newDraggableIndex = _ref.newDraggableIndex;
    var originalEvent = _ref.originalEvent;
    var putSortable = _ref.putSortable;
    var extraEventProperties = _ref.extraEventProperties;
    sortable = sortable || rootEl && rootEl[expando];
    if (!sortable) { return; }
    var evt;
    var options = sortable.options;
    var onName = 'on' + name.charAt(0).toUpperCase() + name.substr(1); // Support for new CustomEvent feature

    if (window.CustomEvent && !IE11OrLess && !Edge) {
        evt = new CustomEvent(name, {
            bubbles: true,
            cancelable: true
        });
    } else {
        evt = document.createEvent('Event');
        evt.initEvent(name, true, true);
    }

    evt.to = toEl || rootEl;
    evt.from = fromEl || rootEl;
    evt.item = targetEl || rootEl;
    evt.clone = cloneEl;
    evt.oldIndex = oldIndex;
    evt.newIndex = newIndex;
    evt.oldDraggableIndex = oldDraggableIndex;
    evt.newDraggableIndex = newDraggableIndex;
    evt.originalEvent = originalEvent;
    evt.pullMode = putSortable ? putSortable.lastPutMode : undefined;

    var allEventProperties = _objectSpread2(_objectSpread2({}, extraEventProperties), PluginManager.getEventProperties(name, sortable));

    for (var option in allEventProperties) {
        evt[option] = allEventProperties[option];
    }

    if (rootEl) {
        rootEl.dispatchEvent(evt);
    }

    if (options[onName]) {
        options[onName].call(sortable, evt);
    }
}

var _excluded = ['evt'];

var pluginEvent = function pluginEvent (eventName, sortable) {
    var _ref = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    var originalEvent = _ref.evt;
    var data = _objectWithoutProperties(_ref, _excluded);

    PluginManager.pluginEvent.bind(Sortable)(eventName, sortable, _objectSpread2({
        dragEl: dragEl,
        parentEl: parentEl,
        ghostEl: ghostEl,
        rootEl: rootEl,
        nextEl: nextEl,
        lastDownEl: lastDownEl,
        cloneEl: cloneEl,
        cloneHidden: cloneHidden,
        dragStarted: moved,
        putSortable: putSortable,
        activeSortable: Sortable.active,
        originalEvent: originalEvent,
        oldIndex: oldIndex,
        oldDraggableIndex: oldDraggableIndex,
        newIndex: newIndex,
        newDraggableIndex: newDraggableIndex,
        hideGhostForTarget: _hideGhostForTarget,
        unhideGhostForTarget: _unhideGhostForTarget,
        cloneNowHidden: function cloneNowHidden () {
            cloneHidden = true;
        },
        cloneNowShown: function cloneNowShown () {
            cloneHidden = false;
        },
        dispatchSortableEvent: function dispatchSortableEvent (name) {
            _dispatchEvent({
                sortable: sortable,
                name: name,
                originalEvent: originalEvent
            });
        }
    }, data));
};

function _dispatchEvent (info) {
    dispatchEvent(_objectSpread2({
        putSortable: putSortable,
        cloneEl: cloneEl,
        targetEl: dragEl,
        rootEl: rootEl,
        oldIndex: oldIndex,
        oldDraggableIndex: oldDraggableIndex,
        newIndex: newIndex,
        newDraggableIndex: newDraggableIndex
    }, info));
}

var dragEl;
var parentEl;
var ghostEl;
var rootEl;
var nextEl;
var lastDownEl;
var cloneEl;
var cloneHidden;
var oldIndex;
var newIndex;
var oldDraggableIndex;
var newDraggableIndex;
var activeGroup;
var putSortable;
var awaitingDragStarted = false;
var ignoreNextClick = false;
var sortables = [];
var tapEvt;
var touchEvt;
var lastDx;
var lastDy;
var tapDistanceLeft;
var tapDistanceTop;
var moved;
var lastTarget;
var lastDirection;
var pastFirstInvertThresh = false;
var isCircumstantialInvert = false;
var targetMoveDistance;
// For positioning ghost absolutely
var ghostRelativeParent;
var ghostRelativeParentInitialScroll = [];
// (left, top)
var _silent = false;
var savedInputChecked = [];
/** @const */

var documentExists = typeof document !== 'undefined';
var PositionGhostAbsolutely = IOS;
var CSSFloatProperty = Edge || IE11OrLess ? 'cssFloat' : 'float';
// This will not pass for IE9, because IE9 DnD only works on anchors
var supportDraggable = documentExists && !ChromeForAndroid && !IOS && 'draggable' in document.createElement('div');
var supportCssPointerEvents = (function () {
    if (!documentExists) { return; } // false when <= IE11

    if (IE11OrLess) {
        return false;
    }

    var el = document.createElement('x');
    el.style.cssText = 'pointer-events:auto';
    return el.style.pointerEvents === 'auto';
}());
var _detectDirection = function _detectDirection (el, options) {
    var elCSS = css(el);
    var elWidth = parseInt(elCSS.width) - parseInt(elCSS.paddingLeft) - parseInt(elCSS.paddingRight) - parseInt(elCSS.borderLeftWidth) - parseInt(elCSS.borderRightWidth);
    var child1 = getChild(el, 0, options);
    var child2 = getChild(el, 1, options);
    var firstChildCSS = child1 && css(child1);
    var secondChildCSS = child2 && css(child2);
    var firstChildWidth = firstChildCSS && parseInt(firstChildCSS.marginLeft) + parseInt(firstChildCSS.marginRight) + getRect(child1).width;
    var secondChildWidth = secondChildCSS && parseInt(secondChildCSS.marginLeft) + parseInt(secondChildCSS.marginRight) + getRect(child2).width;

    if (elCSS.display === 'flex') {
        return elCSS.flexDirection === 'column' || elCSS.flexDirection === 'column-reverse' ? 'vertical' : 'horizontal';
    }

    if (elCSS.display === 'grid') {
        return elCSS.gridTemplateColumns.split(' ').length <= 1 ? 'vertical' : 'horizontal';
    }

    if (child1 && firstChildCSS['float'] && firstChildCSS['float'] !== 'none') {
        var touchingSideChild2 = firstChildCSS['float'] === 'left' ? 'left' : 'right';
        return child2 && (secondChildCSS.clear === 'both' || secondChildCSS.clear === touchingSideChild2) ? 'vertical' : 'horizontal';
    }

    return child1 && (firstChildCSS.display === 'block' || firstChildCSS.display === 'flex' || firstChildCSS.display === 'table' || firstChildCSS.display === 'grid' || firstChildWidth >= elWidth && elCSS[CSSFloatProperty] === 'none' || child2 && elCSS[CSSFloatProperty] === 'none' && firstChildWidth + secondChildWidth > elWidth) ? 'vertical' : 'horizontal';
};
var _dragElInRowColumn = function _dragElInRowColumn (dragRect, targetRect, vertical) {
    var dragElS1Opp = vertical ? dragRect.left : dragRect.top;
    var dragElS2Opp = vertical ? dragRect.right : dragRect.bottom;
    var dragElOppLength = vertical ? dragRect.width : dragRect.height;
    var targetS1Opp = vertical ? targetRect.left : targetRect.top;
    var targetS2Opp = vertical ? targetRect.right : targetRect.bottom;
    var targetOppLength = vertical ? targetRect.width : targetRect.height;
    return dragElS1Opp === targetS1Opp || dragElS2Opp === targetS2Opp || dragElS1Opp + dragElOppLength / 2 === targetS1Opp + targetOppLength / 2;
};

/**
     * Detects first nearest empty sortable to X and Y position using emptyInsertThreshold.
     * @param  {Number} x      X position
     * @param  {Number} y      Y position
     * @return {HTMLElement}   Element of the first found nearest Sortable
     */
var _detectNearestEmptySortable = function _detectNearestEmptySortable (x, y) {
    var ret;
    sortables.some(function (sortable) {
        var threshold = sortable[expando].options.emptyInsertThreshold;
        if (!threshold || lastChild(sortable)) { return; }
        var rect = getRect(sortable);
        var insideHorizontally = x >= rect.left - threshold && x <= rect.right + threshold;
        var insideVertically = y >= rect.top - threshold && y <= rect.bottom + threshold;

        if (insideHorizontally && insideVertically) {
            return ret = sortable;
        }
    });
    return ret;
};
var _prepareGroup = function _prepareGroup (options) {
    function toFn (value, pull) {
        return function (to, from, dragEl, evt) {
            var sameGroup = to.options.group.name && from.options.group.name && to.options.group.name === from.options.group.name;

            if (value == null && (pull || sameGroup)) {
                // Default pull value
                // Default pull and put value if same group
                return true;
            } else if (value == null || value === false) {
                return false;
            } else if (pull && value === 'clone') {
                return value;
            } else if (typeof value === 'function') {
                return toFn(value(to, from, dragEl, evt), pull)(to, from, dragEl, evt);
            } else {
                var otherGroup = (pull ? to : from).options.group.name;
                return value === true || typeof value === 'string' && value === otherGroup || value.join && value.indexOf(otherGroup) > -1;
            }
        };
    }

    var group = {};
    var originalGroup = options.group;

    if (!originalGroup || _typeof(originalGroup) != 'object') {
        originalGroup = {
            name: originalGroup
        };
    }

    group.name = originalGroup.name;
    group.checkPull = toFn(originalGroup.pull, true);
    group.checkPut = toFn(originalGroup.put);
    group.revertClone = originalGroup.revertClone;
    options.group = group;
};
var _hideGhostForTarget = function _hideGhostForTarget () {
    if (!supportCssPointerEvents && ghostEl) {
        css(ghostEl, 'display', 'none');
    }
};
var _unhideGhostForTarget = function _unhideGhostForTarget () {
    if (!supportCssPointerEvents && ghostEl) {
        css(ghostEl, 'display', '');
    }
}; // #1184 fix - Prevent click event on fallback if dragged but item not changed position

if (documentExists) {
    document.addEventListener('click', function (evt) {
        if (ignoreNextClick) {
            evt.preventDefault();
            evt.stopPropagation && evt.stopPropagation();
            evt.stopImmediatePropagation && evt.stopImmediatePropagation();
            ignoreNextClick = false;
            return false;
        }
    }, true);
}

var nearestEmptyInsertDetectEvent = function nearestEmptyInsertDetectEvent (evt) {
    if (dragEl) {
        evt = evt.touches ? evt.touches[0] : evt;

        var nearest = _detectNearestEmptySortable(evt.clientX, evt.clientY);

        if (nearest) {
            // Create imitation event
            var event = {};

            for (var i in evt) {
                if (evt.hasOwnProperty(i)) {
                    event[i] = evt[i];
                }
            }

            event.target = event.rootEl = nearest;
            event.preventDefault = void 0;
            event.stopPropagation = void 0;

            nearest[expando]._onDragOver(event);
        }
    }
};

var _checkOutsideTargetEl = function _checkOutsideTargetEl (evt) {
    if (dragEl) {
        dragEl.parentNode[expando]._isOutsideThisEl(evt.target);
    }
};
/**
 * @class  Sortable
 * @param  {HTMLElement}  el
 * @param  {Object}       [options]
 */

function Sortable (el, options) {
    if (!(el && el.nodeType && el.nodeType === 1)) {
        throw 'Sortable: `el` must be an HTMLElement, not '.concat({}.toString.call(el));
    }

    this.el = el; // root element

    this.options = options = _extends({}, options); // Export instance

    el[expando] = this;
    var defaults = {
        group: null,
        sort: true,
        disabled: false,
        store: null,
        handle: null,
        draggable: /^[uo]l$/i.test(el.nodeName) ? '>li' : '>*',
        swapThreshold: 1,
        // percentage; 0 <= x <= 1
        invertSwap: false,
        // invert always
        invertedSwapThreshold: null,
        // will be set to same as swapThreshold if default
        removeCloneOnHide: true,
        direction: function direction () {
            return _detectDirection(el, this.options);
        },
        ghostClass: 'sortable-ghost',
        chosenClass: 'sortable-chosen',
        dragClass: 'sortable-drag',
        ignore: 'a, img',
        filter: null,
        preventOnFilter: true,
        animation: 0,
        easing: null,
        setData: function setData (dataTransfer, dragEl) {
            dataTransfer.setData('Text', dragEl.textContent);
        },
        dropBubble: false,
        dragoverBubble: false,
        dataIdAttr: 'data-id',
        delay: 0,
        delayOnTouchOnly: false,
        touchStartThreshold: (Number.parseInt ? Number : window).parseInt(window.devicePixelRatio, 10) || 1,
        forceFallback: false,
        fallbackClass: 'sortable-fallback',
        fallbackOnBody: false,
        fallbackTolerance: 0,
        fallbackOffset: {
            x: 0,
            y: 0
        },
        supportPointer: Sortable.supportPointer !== false && 'PointerEvent' in window && !Safari,
        emptyInsertThreshold: 5
    };
    PluginManager.initializePlugins(this, el, defaults); // Set default options

    for (var name in defaults) {
        !(name in options) && (options[name] = defaults[name]);
    }

    _prepareGroup(options); // Bind all private methods

    for (var fn in this) {
        if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
            this[fn] = this[fn].bind(this);
        }
    } // Setup drag mode

    this.nativeDraggable = options.forceFallback ? false : supportDraggable;

    if (this.nativeDraggable) {
        // Touch start threshold cannot be greater than the native dragstart threshold
        this.options.touchStartThreshold = 1;
    } // Bind events

    if (options.supportPointer) {
        on(el, 'pointerdown', this._onTapStart);
    } else {
        on(el, 'mousedown', this._onTapStart);
        on(el, 'touchstart', this._onTapStart);
    }

    if (this.nativeDraggable) {
        on(el, 'dragover', this);
        on(el, 'dragenter', this);
    }

    sortables.push(this.el); // Restore sorting

    options.store && options.store.get && this.sort(options.store.get(this) || []); // Add animation state manager

    _extends(this, AnimationStateManager());
}

Sortable.prototype =
    /** @lends Sortable.prototype */
    {
        constructor: Sortable,
        _isOutsideThisEl: function _isOutsideThisEl (target) {
            if (!this.el.contains(target) && target !== this.el) {
                lastTarget = null;
            }
        },
        _getDirection: function _getDirection (evt, target) {
            return typeof this.options.direction === 'function' ? this.options.direction.call(this, evt, target, dragEl) : this.options.direction;
        },
        _onTapStart: function _onTapStart (
            /** Event|TouchEvent */
            evt) {
            if (!evt.cancelable) { return; }

            var _this = this;
            var el = this.el;
            var options = this.options;
            var preventOnFilter = options.preventOnFilter;
            var type = evt.type;
            var touch = evt.touches && evt.touches[0] || evt.pointerType && evt.pointerType === 'touch' && evt;
            var target = (touch || evt).target;
            var originalTarget = evt.target.shadowRoot && (evt.path && evt.path[0] || evt.composedPath && evt.composedPath()[0]) || target;
            var filter = options.filter;

            _saveInputCheckedState(el); // Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.

            if (dragEl) {
                return;
            }

            if (/mousedown|pointerdown/.test(type) && evt.button !== 0 || options.disabled) {
                return; // only left button and enabled
            } // cancel dnd if original target is content editable

            if (originalTarget.isContentEditable) {
                return;
            } // Safari ignores further event handling after mousedown

            if (!this.nativeDraggable && Safari && target && target.tagName.toUpperCase() === 'SELECT') {
                return;
            }

            target = closest(target, options.draggable, el, false);

            if (target && target.animated) {
                return;
            }

            if (lastDownEl === target) {
                // Ignoring duplicate `down`
                return;
            } // Get the index of the dragged element within its parent

            oldIndex = index(target);
            oldDraggableIndex = index(target, options.draggable); // Check filter

            if (typeof filter === 'function') {
                if (filter.call(this, evt, target, this)) {
                    _dispatchEvent({
                        sortable: _this,
                        rootEl: originalTarget,
                        name: 'filter',
                        targetEl: target,
                        toEl: el,
                        fromEl: el
                    });

                    pluginEvent('filter', _this, {
                        evt: evt
                    });
                    preventOnFilter && evt.cancelable && evt.preventDefault();
                    return; // cancel dnd
                }
            } else if (filter) {
                filter = filter.split(',').some(function (criteria) {
                    criteria = closest(originalTarget, criteria.trim(), el, false);

                    if (criteria) {
                        _dispatchEvent({
                            sortable: _this,
                            rootEl: criteria,
                            name: 'filter',
                            targetEl: target,
                            fromEl: el,
                            toEl: el
                        });

                        pluginEvent('filter', _this, {
                            evt: evt
                        });
                        return true;
                    }
                });

                if (filter) {
                    preventOnFilter && evt.cancelable && evt.preventDefault();
                    return; // cancel dnd
                }
            }

            if (options.handle && !closest(originalTarget, options.handle, el, false)) {
                return;
            } // Prepare `dragstart`

            this._prepareDragStart(evt, touch, target);
        },
        _prepareDragStart: function _prepareDragStart (
            /** Event */
            evt,
            /** Touch */
            touch,
            /** HTMLElement */
            target) {
            var _this = this;
            var el = _this.el;
            var options = _this.options;
            var ownerDocument = el.ownerDocument;
            var dragStartFn;

            if (target && !dragEl && target.parentNode === el) {
                var dragRect = getRect(target);
                rootEl = el;
                dragEl = target;
                parentEl = dragEl.parentNode;
                nextEl = dragEl.nextSibling;
                lastDownEl = target;
                activeGroup = options.group;
                Sortable.dragged = dragEl;
                tapEvt = {
                    target: dragEl,
                    clientX: (touch || evt).clientX,
                    clientY: (touch || evt).clientY
                };
                tapDistanceLeft = tapEvt.clientX - dragRect.left;
                tapDistanceTop = tapEvt.clientY - dragRect.top;
                this._lastX = (touch || evt).clientX;
                this._lastY = (touch || evt).clientY;
                dragEl.style['will-change'] = 'all';

                dragStartFn = function dragStartFn () {
                    pluginEvent('delayEnded', _this, {
                        evt: evt
                    });

                    if (Sortable.eventCanceled) {
                        _this._onDrop();

                        return;
                    } // Delayed drag has been triggered
                    // we can re-enable the events: touchmove/mousemove

                    _this._disableDelayedDragEvents();

                    if (!FireFox && _this.nativeDraggable) {
                        dragEl.draggable = true;
                    } // Bind the events: dragstart/dragend

                    _this._triggerDragStart(evt, touch); // Drag start event

                    _dispatchEvent({
                        sortable: _this,
                        name: 'choose',
                        originalEvent: evt
                    }); // Chosen item

                    toggleClass(dragEl, options.chosenClass, true);
                }; // Disable "draggable"

                options.ignore.split(',').forEach(function (criteria) {
                    find(dragEl, criteria.trim(), _disableDraggable);
                });
                on(ownerDocument, 'dragover', nearestEmptyInsertDetectEvent);
                on(ownerDocument, 'mousemove', nearestEmptyInsertDetectEvent);
                on(ownerDocument, 'touchmove', nearestEmptyInsertDetectEvent);
                on(ownerDocument, 'mouseup', _this._onDrop);
                on(ownerDocument, 'touchend', _this._onDrop);
                on(ownerDocument, 'touchcancel', _this._onDrop); // Make dragEl draggable (must be before delay for FireFox)

                if (FireFox && this.nativeDraggable) {
                    this.options.touchStartThreshold = 4;
                    dragEl.draggable = true;
                }

                pluginEvent('delayStart', this, {
                    evt: evt
                }); // Delay is impossible for native DnD in Edge or IE

                if (options.delay && (!options.delayOnTouchOnly || touch) && (!this.nativeDraggable || !(Edge || IE11OrLess))) {
                    if (Sortable.eventCanceled) {
                        this._onDrop();

                        return;
                    } // If the user moves the pointer or let go the click or touch
                    // before the delay has been reached:
                    // disable the delayed drag

                    on(ownerDocument, 'mouseup', _this._disableDelayedDrag);
                    on(ownerDocument, 'touchend', _this._disableDelayedDrag);
                    on(ownerDocument, 'touchcancel', _this._disableDelayedDrag);
                    on(ownerDocument, 'mousemove', _this._delayedDragTouchMoveHandler);
                    on(ownerDocument, 'touchmove', _this._delayedDragTouchMoveHandler);
                    options.supportPointer && on(ownerDocument, 'pointermove', _this._delayedDragTouchMoveHandler);
                    _this._dragStartTimer = setTimeout(dragStartFn, options.delay);
                } else {
                    dragStartFn();
                }
            }
        },
        _delayedDragTouchMoveHandler: function _delayedDragTouchMoveHandler (
            /** TouchEvent|PointerEvent **/
            e) {
            var touch = e.touches ? e.touches[0] : e;

            if (Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(touch.clientY - this._lastY)) >= Math.floor(this.options.touchStartThreshold / (this.nativeDraggable && window.devicePixelRatio || 1))) {
                this._disableDelayedDrag();
            }
        },
        _disableDelayedDrag: function _disableDelayedDrag () {
            dragEl && _disableDraggable(dragEl);
            clearTimeout(this._dragStartTimer);

            this._disableDelayedDragEvents();
        },
        _disableDelayedDragEvents: function _disableDelayedDragEvents () {
            var ownerDocument = this.el.ownerDocument;
            off(ownerDocument, 'mouseup', this._disableDelayedDrag);
            off(ownerDocument, 'touchend', this._disableDelayedDrag);
            off(ownerDocument, 'touchcancel', this._disableDelayedDrag);
            off(ownerDocument, 'mousemove', this._delayedDragTouchMoveHandler);
            off(ownerDocument, 'touchmove', this._delayedDragTouchMoveHandler);
            off(ownerDocument, 'pointermove', this._delayedDragTouchMoveHandler);
        },
        _triggerDragStart: function _triggerDragStart (
            /** Event */
            evt,
            /** Touch */
            touch) {
            touch = touch || evt.pointerType == 'touch' && evt;

            if (!this.nativeDraggable || touch) {
                if (this.options.supportPointer) {
                    on(document, 'pointermove', this._onTouchMove);
                } else if (touch) {
                    on(document, 'touchmove', this._onTouchMove);
                } else {
                    on(document, 'mousemove', this._onTouchMove);
                }
            } else {
                on(dragEl, 'dragend', this);
                on(rootEl, 'dragstart', this._onDragStart);
            }

            try {
                if (document.selection) {
                    // Timeout neccessary for IE9
                    _nextTick(function () {
                        document.selection.empty();
                    });
                } else {
                    window.getSelection().removeAllRanges();
                }
            } catch (err) {}
        },
        _dragStarted: function _dragStarted (fallback, evt) {
            awaitingDragStarted = false;

            if (rootEl && dragEl) {
                pluginEvent('dragStarted', this, {
                    evt: evt
                });

                if (this.nativeDraggable) {
                    on(document, 'dragover', _checkOutsideTargetEl);
                }

                var options = this.options; // Apply effect

                !fallback && toggleClass(dragEl, options.dragClass, false);
                toggleClass(dragEl, options.ghostClass, true);
                Sortable.active = this;
                fallback && this._appendGhost(); // Drag start event

                _dispatchEvent({
                    sortable: this,
                    name: 'start',
                    originalEvent: evt
                });
            } else {
                this._nulling();
            }
        },
        _emulateDragOver: function _emulateDragOver () {
            if (touchEvt) {
                this._lastX = touchEvt.clientX;
                this._lastY = touchEvt.clientY;

                _hideGhostForTarget();

                var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
                var parent = target;

                while (target && target.shadowRoot) {
                    target = target.shadowRoot.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
                    if (target === parent) { break; }
                    parent = target;
                }

                dragEl.parentNode[expando]._isOutsideThisEl(target);

                if (parent) {
                    do {
                        if (parent[expando]) {
                            var inserted = void 0;
                            inserted = parent[expando]._onDragOver({
                                clientX: touchEvt.clientX,
                                clientY: touchEvt.clientY,
                                target: target,
                                rootEl: parent
                            });

                            if (inserted && !this.options.dragoverBubble) {
                                break;
                            }
                        }

                        target = parent; // store last element
                    }
                    /* jshint boss:true */
                    while (parent = parent.parentNode);
                }

                _unhideGhostForTarget();
            }
        },
        _onTouchMove: function _onTouchMove (
            /** TouchEvent */
            evt) {
            if (tapEvt) {
                var options = this.options;
                var fallbackTolerance = options.fallbackTolerance;
                var fallbackOffset = options.fallbackOffset;
                var touch = evt.touches ? evt.touches[0] : evt;
                var ghostMatrix = ghostEl && matrix(ghostEl, true);
                var scaleX = ghostEl && ghostMatrix && ghostMatrix.a;
                var scaleY = ghostEl && ghostMatrix && ghostMatrix.d;
                var relativeScrollOffset = PositionGhostAbsolutely && ghostRelativeParent && getRelativeScrollOffset(ghostRelativeParent);
                var dx = (touch.clientX - tapEvt.clientX + fallbackOffset.x) / (scaleX || 1) + (relativeScrollOffset ? relativeScrollOffset[0] - ghostRelativeParentInitialScroll[0] : 0) / (scaleX || 1);
                var dy = (touch.clientY - tapEvt.clientY + fallbackOffset.y) / (scaleY || 1) + (relativeScrollOffset ? relativeScrollOffset[1] - ghostRelativeParentInitialScroll[1] : 0) / (scaleY || 1); // only set the status to dragging, when we are actually dragging

                if (!Sortable.active && !awaitingDragStarted) {
                    if (fallbackTolerance && Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(touch.clientY - this._lastY)) < fallbackTolerance) {
                        return;
                    }

                    this._onDragStart(evt, true);
                }

                if (ghostEl) {
                    if (ghostMatrix) {
                        ghostMatrix.e += dx - (lastDx || 0);
                        ghostMatrix.f += dy - (lastDy || 0);
                    } else {
                        ghostMatrix = {
                            a: 1,
                            b: 0,
                            c: 0,
                            d: 1,
                            e: dx,
                            f: dy
                        };
                    }

                    var cssMatrix = 'matrix('.concat(ghostMatrix.a, ',').concat(ghostMatrix.b, ',').concat(ghostMatrix.c, ',').concat(ghostMatrix.d, ',').concat(ghostMatrix.e, ',').concat(ghostMatrix.f, ')');
                    css(ghostEl, 'webkitTransform', cssMatrix);
                    css(ghostEl, 'mozTransform', cssMatrix);
                    css(ghostEl, 'msTransform', cssMatrix);
                    css(ghostEl, 'transform', cssMatrix);
                    lastDx = dx;
                    lastDy = dy;
                    touchEvt = touch;
                }

                evt.cancelable && evt.preventDefault();
            }
        },
        _appendGhost: function _appendGhost () {
            // Bug if using scale(): https://stackoverflow.com/questions/2637058
            // Not being adjusted for
            if (!ghostEl) {
                var container = this.options.fallbackOnBody ? document.body : rootEl;
                var rect = getRect(dragEl, true, PositionGhostAbsolutely, true, container);
                var options = this.options; // Position absolutely

                if (PositionGhostAbsolutely) {
                    // Get relatively positioned parent
                    ghostRelativeParent = container;

                    while (css(ghostRelativeParent, 'position') === 'static' && css(ghostRelativeParent, 'transform') === 'none' && ghostRelativeParent !== document) {
                        ghostRelativeParent = ghostRelativeParent.parentNode;
                    }

                    if (ghostRelativeParent !== document.body && ghostRelativeParent !== document.documentElement) {
                        if (ghostRelativeParent === document) { ghostRelativeParent = getWindowScrollingElement(); }
                        rect.top += ghostRelativeParent.scrollTop;
                        rect.left += ghostRelativeParent.scrollLeft;
                    } else {
                        ghostRelativeParent = getWindowScrollingElement();
                    }

                    ghostRelativeParentInitialScroll = getRelativeScrollOffset(ghostRelativeParent);
                }

                ghostEl = dragEl.cloneNode(true);
                toggleClass(ghostEl, options.ghostClass, false);
                toggleClass(ghostEl, options.fallbackClass, true);
                toggleClass(ghostEl, options.dragClass, true);
                css(ghostEl, 'transition', '');
                css(ghostEl, 'transform', '');
                css(ghostEl, 'box-sizing', 'border-box');
                css(ghostEl, 'margin', 0);
                css(ghostEl, 'top', rect.top);
                css(ghostEl, 'left', rect.left);
                css(ghostEl, 'width', rect.width);
                css(ghostEl, 'height', rect.height);
                css(ghostEl, 'opacity', '0.8');
                css(ghostEl, 'position', PositionGhostAbsolutely ? 'absolute' : 'fixed');
                css(ghostEl, 'zIndex', '100000');
                css(ghostEl, 'pointerEvents', 'none');
                Sortable.ghost = ghostEl;
                container.appendChild(ghostEl); // Set transform-origin

                css(ghostEl, 'transform-origin', tapDistanceLeft / parseInt(ghostEl.style.width) * 100 + '% ' + tapDistanceTop / parseInt(ghostEl.style.height) * 100 + '%');
            }
        },
        _onDragStart: function _onDragStart (
            /** Event */
            evt,
            /** boolean */
            fallback) {
            var _this = this;

            var dataTransfer = evt.dataTransfer;
            var options = _this.options;
            pluginEvent('dragStart', this, {
                evt: evt
            });

            if (Sortable.eventCanceled) {
                this._onDrop();

                return;
            }

            pluginEvent('setupClone', this);

            if (!Sortable.eventCanceled) {
                cloneEl = clone(dragEl);
                cloneEl.draggable = false;
                cloneEl.style['will-change'] = '';

                this._hideClone();

                toggleClass(cloneEl, this.options.chosenClass, false);
                Sortable.clone = cloneEl;
            } // #1143: IFrame support workaround

            _this.cloneId = _nextTick(function () {
                pluginEvent('clone', _this);
                if (Sortable.eventCanceled) { return; }

                if (!_this.options.removeCloneOnHide) {
                    rootEl.insertBefore(cloneEl, dragEl);
                }

                _this._hideClone();

                _dispatchEvent({
                    sortable: _this,
                    name: 'clone'
                });
            });
            !fallback && toggleClass(dragEl, options.dragClass, true); // Set proper drop events

            if (fallback) {
                ignoreNextClick = true;
                _this._loopId = setInterval(_this._emulateDragOver, 50);
            } else {
                // Undo what was set in _prepareDragStart before drag started
                off(document, 'mouseup', _this._onDrop);
                off(document, 'touchend', _this._onDrop);
                off(document, 'touchcancel', _this._onDrop);

                if (dataTransfer) {
                    dataTransfer.effectAllowed = 'move';
                    options.setData && options.setData.call(_this, dataTransfer, dragEl);
                }

                on(document, 'drop', _this); // #1276 fix:

                css(dragEl, 'transform', 'translateZ(0)');
            }

            awaitingDragStarted = true;
            _this._dragStartId = _nextTick(_this._dragStarted.bind(_this, fallback, evt));
            on(document, 'selectstart', _this);
            moved = true;

            if (Safari) {
                css(document.body, 'user-select', 'none');
            }
        },
        // Returns true - if no further action is needed (either inserted or another condition)
        _onDragOver: function _onDragOver (
            /** Event */
            evt) {
            var el = this.el;
            var target = evt.target;
            var dragRect;
            var targetRect;
            var revert;
            var options = this.options;
            var group = options.group;
            var activeSortable = Sortable.active;
            var isOwner = activeGroup === group;
            var canSort = options.sort;
            var fromSortable = putSortable || activeSortable;
            var vertical;
            var _this = this;
            var completedFired = false;

            if (_silent) { return; }

            function dragOverEvent (name, extra) {
                pluginEvent(name, _this, _objectSpread2({
                    evt: evt,
                    isOwner: isOwner,
                    axis: vertical ? 'vertical' : 'horizontal',
                    revert: revert,
                    dragRect: dragRect,
                    targetRect: targetRect,
                    canSort: canSort,
                    fromSortable: fromSortable,
                    target: target,
                    completed: completed,
                    onMove: function onMove (target, after) {
                        return _onMove(rootEl, el, dragEl, dragRect, target, getRect(target), evt, after);
                    },
                    changed: changed
                }, extra));
            } // Capture animation state

            function capture () {
                dragOverEvent('dragOverAnimationCapture');

                _this.captureAnimationState();

                if (_this !== fromSortable) {
                    fromSortable.captureAnimationState();
                }
            } // Return invocation when dragEl is inserted (or completed)

            function completed (insertion) {
                dragOverEvent('dragOverCompleted', {
                    insertion: insertion
                });

                if (insertion) {
                    // Clones must be hidden before folding animation to capture dragRectAbsolute properly
                    if (isOwner) {
                        activeSortable._hideClone();
                    } else {
                        activeSortable._showClone(_this);
                    }

                    if (_this !== fromSortable) {
                        // Set ghost class to new sortable's ghost class
                        toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : activeSortable.options.ghostClass, false);
                        toggleClass(dragEl, options.ghostClass, true);
                    }

                    if (putSortable !== _this && _this !== Sortable.active) {
                        putSortable = _this;
                    } else if (_this === Sortable.active && putSortable) {
                        putSortable = null;
                    } // Animation

                    if (fromSortable === _this) {
                        _this._ignoreWhileAnimating = target;
                    }

                    _this.animateAll(function () {
                        dragOverEvent('dragOverAnimationComplete');
                        _this._ignoreWhileAnimating = null;
                    });

                    if (_this !== fromSortable) {
                        fromSortable.animateAll();
                        fromSortable._ignoreWhileAnimating = null;
                    }
                } // Null lastTarget if it is not inside a previously swapped element

                if (target === dragEl && !dragEl.animated || target === el && !target.animated) {
                    lastTarget = null;
                } // no bubbling and not fallback

                if (!options.dragoverBubble && !evt.rootEl && target !== document) {
                    dragEl.parentNode[expando]._isOutsideThisEl(evt.target); // Do not detect for empty insert if already inserted

                    !insertion && nearestEmptyInsertDetectEvent(evt);
                }

                !options.dragoverBubble && evt.stopPropagation && evt.stopPropagation();
                return completedFired = true;
            } // Call when dragEl has been inserted

            function changed () {
                newIndex = index(dragEl);
                newDraggableIndex = index(dragEl, options.draggable);

                _dispatchEvent({
                    sortable: _this,
                    name: 'change',
                    toEl: el,
                    newIndex: newIndex,
                    newDraggableIndex: newDraggableIndex,
                    originalEvent: evt
                });
            }

            if (evt.preventDefault !== void 0) {
                evt.cancelable && evt.preventDefault();
            }

            target = closest(target, options.draggable, el, true);
            dragOverEvent('dragOver');
            if (Sortable.eventCanceled) { return completedFired; }

            if (dragEl.contains(evt.target) || target.animated && target.animatingX && target.animatingY || _this._ignoreWhileAnimating === target) {
                return completed(false);
            }

            ignoreNextClick = false;

            if (activeSortable && !options.disabled && (isOwner ? canSort || (revert = parentEl !== rootEl) // Reverting item into the original list
                : putSortable === this || (this.lastPutMode = activeGroup.checkPull(this, activeSortable, dragEl, evt)) && group.checkPut(this, activeSortable, dragEl, evt))) {
                vertical = this._getDirection(evt, target) === 'vertical';
                dragRect = getRect(dragEl);
                dragOverEvent('dragOverValid');
                if (Sortable.eventCanceled) { return completedFired; }

                if (revert) {
                    parentEl = rootEl; // actualization

                    capture();

                    this._hideClone();

                    dragOverEvent('revert');

                    if (!Sortable.eventCanceled) {
                        if (nextEl) {
                            rootEl.insertBefore(dragEl, nextEl);
                        } else {
                            rootEl.appendChild(dragEl);
                        }
                    }

                    return completed(true);
                }

                var elLastChild = lastChild(el, options.draggable);

                if (!elLastChild || _ghostIsLast(evt, vertical, this) && !elLastChild.animated) {
                    // Insert to end of list
                    // If already at end of list: Do not insert
                    if (elLastChild === dragEl) {
                        return completed(false);
                    } // if there is a last element, it is the target

                    if (elLastChild && el === evt.target) {
                        target = elLastChild;
                    }

                    if (target) {
                        targetRect = getRect(target);
                    }

                    if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, !!target) !== false) {
                        capture();
                        el.appendChild(dragEl);
                        parentEl = el; // actualization

                        changed();
                        return completed(true);
                    }
                } else if (elLastChild && _ghostIsFirst(evt, vertical, this)) {
                    // Insert to start of list
                    var firstChild = getChild(el, 0, options, true);

                    if (firstChild === dragEl) {
                        return completed(false);
                    }

                    target = firstChild;
                    targetRect = getRect(target);

                    if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, false) !== false) {
                        capture();
                        el.insertBefore(dragEl, firstChild);
                        parentEl = el; // actualization

                        changed();
                        return completed(true);
                    }
                } else if (target.parentNode === el) {
                    targetRect = getRect(target);
                    var direction = 0;
                    var targetBeforeFirstSwap;
                    var differentLevel = dragEl.parentNode !== el;
                    var differentRowCol = !_dragElInRowColumn(dragEl.animated && dragEl.toRect || dragRect, target.animated && target.toRect || targetRect, vertical);
                    var side1 = vertical ? 'top' : 'left';
                    var scrolledPastTop = isScrolledPast(target, 'top', 'top') || isScrolledPast(dragEl, 'top', 'top');
                    var scrollBefore = scrolledPastTop ? scrolledPastTop.scrollTop : void 0;

                    if (lastTarget !== target) {
                        targetBeforeFirstSwap = targetRect[side1];
                        pastFirstInvertThresh = false;
                        isCircumstantialInvert = !differentRowCol && options.invertSwap || differentLevel;
                    }

                    direction = _getSwapDirection(evt, target, targetRect, vertical, differentRowCol ? 1 : options.swapThreshold, options.invertedSwapThreshold == null ? options.swapThreshold : options.invertedSwapThreshold, isCircumstantialInvert, lastTarget === target);
                    var sibling;

                    if (direction !== 0) {
                        // Check if target is beside dragEl in respective direction (ignoring hidden elements)
                        var dragIndex = index(dragEl);

                        do {
                            dragIndex -= direction;
                            sibling = parentEl.children[dragIndex];
                        } while (sibling && (css(sibling, 'display') === 'none' || sibling === ghostEl));
                    } // If dragEl is already beside target: Do not insert

                    if (direction === 0 || sibling === target) {
                        return completed(false);
                    }

                    lastTarget = target;
                    lastDirection = direction;
                    var nextSibling = target.nextElementSibling;
                    var after = false;
                    after = direction === 1;

                    var moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, after);

                    if (moveVector !== false) {
                        if (moveVector === 1 || moveVector === -1) {
                            after = moveVector === 1;
                        }

                        _silent = true;
                        setTimeout(_unsilent, 30);
                        capture();

                        if (after && !nextSibling) {
                            el.appendChild(dragEl);
                        } else {
                            target.parentNode.insertBefore(dragEl, after ? nextSibling : target);
                        } // Undo chrome's scroll adjustment (has no effect on other browsers)

                        if (scrolledPastTop) {
                            scrollBy(scrolledPastTop, 0, scrollBefore - scrolledPastTop.scrollTop);
                        }

                        parentEl = dragEl.parentNode; // actualization
                        // must be done before animation

                        if (targetBeforeFirstSwap !== undefined && !isCircumstantialInvert) {
                            targetMoveDistance = Math.abs(targetBeforeFirstSwap - getRect(target)[side1]);
                        }

                        changed();
                        return completed(true);
                    }
                }

                if (el.contains(dragEl)) {
                    return completed(false);
                }
            }

            return false;
        },
        _ignoreWhileAnimating: null,
        _offMoveEvents: function _offMoveEvents () {
            off(document, 'mousemove', this._onTouchMove);
            off(document, 'touchmove', this._onTouchMove);
            off(document, 'pointermove', this._onTouchMove);
            off(document, 'dragover', nearestEmptyInsertDetectEvent);
            off(document, 'mousemove', nearestEmptyInsertDetectEvent);
            off(document, 'touchmove', nearestEmptyInsertDetectEvent);
        },
        _offUpEvents: function _offUpEvents () {
            var ownerDocument = this.el.ownerDocument;
            off(ownerDocument, 'mouseup', this._onDrop);
            off(ownerDocument, 'touchend', this._onDrop);
            off(ownerDocument, 'pointerup', this._onDrop);
            off(ownerDocument, 'touchcancel', this._onDrop);
            off(document, 'selectstart', this);
        },
        _onDrop: function _onDrop (
            /** Event */
            evt) {
            var el = this.el;
            var options = this.options; // Get the index of the dragged element within its parent

            newIndex = index(dragEl);
            newDraggableIndex = index(dragEl, options.draggable);
            pluginEvent('drop', this, {
                evt: evt
            });
            parentEl = dragEl && dragEl.parentNode; // Get again after plugin event

            newIndex = index(dragEl);
            newDraggableIndex = index(dragEl, options.draggable);

            if (Sortable.eventCanceled) {
                this._nulling();

                return;
            }

            awaitingDragStarted = false;
            isCircumstantialInvert = false;
            pastFirstInvertThresh = false;
            clearInterval(this._loopId);
            clearTimeout(this._dragStartTimer);

            _cancelNextTick(this.cloneId);

            _cancelNextTick(this._dragStartId); // Unbind events

            if (this.nativeDraggable) {
                off(document, 'drop', this);
                off(el, 'dragstart', this._onDragStart);
            }

            this._offMoveEvents();

            this._offUpEvents();

            if (Safari) {
                css(document.body, 'user-select', '');
            }

            css(dragEl, 'transform', '');

            if (evt) {
                if (moved) {
                    evt.cancelable && evt.preventDefault();
                    !options.dropBubble && evt.stopPropagation();
                }

                ghostEl && ghostEl.parentNode && ghostEl.parentNode.removeChild(ghostEl);

                if (rootEl === parentEl || putSortable && putSortable.lastPutMode !== 'clone') {
                    // Remove clone(s)
                    cloneEl && cloneEl.parentNode && cloneEl.parentNode.removeChild(cloneEl);
                }

                if (dragEl) {
                    if (this.nativeDraggable) {
                        off(dragEl, 'dragend', this);
                    }

                    _disableDraggable(dragEl);

                    dragEl.style['will-change'] = ''; // Remove classes
                    // ghostClass is added in dragStarted

                    if (moved && !awaitingDragStarted) {
                        toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : this.options.ghostClass, false);
                    }

                    toggleClass(dragEl, this.options.chosenClass, false); // Drag stop event

                    _dispatchEvent({
                        sortable: this,
                        name: 'unchoose',
                        toEl: parentEl,
                        newIndex: null,
                        newDraggableIndex: null,
                        originalEvent: evt
                    });

                    if (rootEl !== parentEl) {
                        if (newIndex >= 0) {
                            // Add event
                            _dispatchEvent({
                                rootEl: parentEl,
                                name: 'add',
                                toEl: parentEl,
                                fromEl: rootEl,
                                originalEvent: evt
                            }); // Remove event

                            _dispatchEvent({
                                sortable: this,
                                name: 'remove',
                                toEl: parentEl,
                                originalEvent: evt
                            }); // drag from one list and drop into another

                            _dispatchEvent({
                                rootEl: parentEl,
                                name: 'sort',
                                toEl: parentEl,
                                fromEl: rootEl,
                                originalEvent: evt
                            });

                            _dispatchEvent({
                                sortable: this,
                                name: 'sort',
                                toEl: parentEl,
                                originalEvent: evt
                            });
                        }

                        putSortable && putSortable.save();
                    } else {
                        if (newIndex !== oldIndex) {
                            if (newIndex >= 0) {
                                // drag & drop within the same list
                                _dispatchEvent({
                                    sortable: this,
                                    name: 'update',
                                    toEl: parentEl,
                                    originalEvent: evt
                                });

                                _dispatchEvent({
                                    sortable: this,
                                    name: 'sort',
                                    toEl: parentEl,
                                    originalEvent: evt
                                });
                            }
                        }
                    }

                    if (Sortable.active) {
                        /* jshint eqnull:true */
                        if (newIndex == null || newIndex === -1) {
                            newIndex = oldIndex;
                            newDraggableIndex = oldDraggableIndex;
                        }

                        _dispatchEvent({
                            sortable: this,
                            name: 'end',
                            toEl: parentEl,
                            originalEvent: evt
                        }); // Save sorting

                        this.save();
                    }
                }
            }

            this._nulling();
        },
        _nulling: function _nulling () {
            pluginEvent('nulling', this);
            rootEl = dragEl = parentEl = ghostEl = nextEl = cloneEl = lastDownEl = cloneHidden = tapEvt = touchEvt = moved = newIndex = newDraggableIndex = oldIndex = oldDraggableIndex = lastTarget = lastDirection = putSortable = activeGroup = Sortable.dragged = Sortable.ghost = Sortable.clone = Sortable.active = null;
            savedInputChecked.forEach(function (el) {
                el.checked = true;
            });
            savedInputChecked.length = lastDx = lastDy = 0;
        },
        handleEvent: function handleEvent (
            /** Event */
            evt) {
            switch (evt.type) {
            case 'drop':
            case 'dragend':
                this._onDrop(evt);

                break;

            case 'dragenter':
            case 'dragover':
                if (dragEl) {
                    this._onDragOver(evt);

                    _globalDragOver(evt);
                }

                break;

            case 'selectstart':
                evt.preventDefault();
                break;
            }
        },

        /**
         * Serializes the item into an array of string.
         * @returns {String[]}
         */
        toArray: function toArray () {
            var order = [];
            var el;
            var children = this.el.children;
            var i = 0;
            var n = children.length;
            var options = this.options;

            for (; i < n; i++) {
                el = children[i];

                if (closest(el, options.draggable, this.el, false)) {
                    order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
                }
            }

            return order;
        },

        /**
         * Sorts the elements according to the array.
         * @param  {String[]}  order  order of the items
         */
        sort: function sort (order, useAnimation) {
            var items = {};
            var rootEl = this.el;
            this.toArray().forEach(function (id, i) {
                var el = rootEl.children[i];

                if (closest(el, this.options.draggable, rootEl, false)) {
                    items[id] = el;
                }
            }, this);
            useAnimation && this.captureAnimationState();
            order.forEach(function (id) {
                if (items[id]) {
                    rootEl.removeChild(items[id]);
                    rootEl.appendChild(items[id]);
                }
            });
            useAnimation && this.animateAll();
        },

        /**
         * Save the current sorting
         */
        save: function save () {
            var store = this.options.store;
            store && store.set && store.set(this);
        },

        /**
         * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
         * @param   {HTMLElement}  el
         * @param   {String}       [selector]  default: `options.draggable`
         * @returns {HTMLElement|null}
         */
        closest: function closest$1 (el, selector) {
            return closest(el, selector || this.options.draggable, this.el, false);
        },

        /**
         * Set/get option
         * @param   {string} name
         * @param   {*}      [value]
         * @returns {*}
         */
        option: function option (name, value) {
            var options = this.options;

            if (value === void 0) {
                return options[name];
            } else {
                var modifiedValue = PluginManager.modifyOption(this, name, value);

                if (typeof modifiedValue !== 'undefined') {
                    options[name] = modifiedValue;
                } else {
                    options[name] = value;
                }

                if (name === 'group') {
                    _prepareGroup(options);
                }
            }
        },

        /**
         * Destroy
         */
        destroy: function destroy () {
            pluginEvent('destroy', this);
            var el = this.el;
            el[expando] = null;
            off(el, 'mousedown', this._onTapStart);
            off(el, 'touchstart', this._onTapStart);
            off(el, 'pointerdown', this._onTapStart);

            if (this.nativeDraggable) {
                off(el, 'dragover', this);
                off(el, 'dragenter', this);
            } // Remove draggable attributes

            Array.prototype.forEach.call(el.querySelectorAll('[draggable]'), function (el) {
                el.removeAttribute('draggable');
            });

            this._onDrop();

            this._disableDelayedDragEvents();

            sortables.splice(sortables.indexOf(this.el), 1);
            this.el = el = null;
        },
        _hideClone: function _hideClone () {
            if (!cloneHidden) {
                pluginEvent('hideClone', this);
                if (Sortable.eventCanceled) { return; }
                css(cloneEl, 'display', 'none');

                if (this.options.removeCloneOnHide && cloneEl.parentNode) {
                    cloneEl.parentNode.removeChild(cloneEl);
                }

                cloneHidden = true;
            }
        },
        _showClone: function _showClone (putSortable) {
            if (putSortable.lastPutMode !== 'clone') {
                this._hideClone();

                return;
            }

            if (cloneHidden) {
                pluginEvent('showClone', this);
                if (Sortable.eventCanceled) { return; } // show clone at dragEl or original position

                if (dragEl.parentNode == rootEl && !this.options.group.revertClone) {
                    rootEl.insertBefore(cloneEl, dragEl);
                } else if (nextEl) {
                    rootEl.insertBefore(cloneEl, nextEl);
                } else {
                    rootEl.appendChild(cloneEl);
                }

                if (this.options.group.revertClone) {
                    this.animate(dragEl, cloneEl);
                }

                css(cloneEl, 'display', '');
                cloneHidden = false;
            }
        }
    };

function _globalDragOver (
    /** Event */
    evt) {
    if (evt.dataTransfer) {
        evt.dataTransfer.dropEffect = 'move';
    }

    evt.cancelable && evt.preventDefault();
}

function _onMove (fromEl, toEl, dragEl, dragRect, targetEl, targetRect, originalEvent, willInsertAfter) {
    var evt;
    var sortable = fromEl[expando];
    var onMoveFn = sortable.options.onMove;
    var retVal; // Support for new CustomEvent feature

    if (window.CustomEvent && !IE11OrLess && !Edge) {
        evt = new CustomEvent('move', {
            bubbles: true,
            cancelable: true
        });
    } else {
        evt = document.createEvent('Event');
        evt.initEvent('move', true, true);
    }

    evt.to = toEl;
    evt.from = fromEl;
    evt.dragged = dragEl;
    evt.draggedRect = dragRect;
    evt.related = targetEl || toEl;
    evt.relatedRect = targetRect || getRect(toEl);
    evt.willInsertAfter = willInsertAfter;
    evt.originalEvent = originalEvent;
    fromEl.dispatchEvent(evt);

    if (onMoveFn) {
        retVal = onMoveFn.call(sortable, evt, originalEvent);
    }

    return retVal;
}

function _disableDraggable (el) {
    el.draggable = false;
}

function _unsilent () {
    _silent = false;
}

function _ghostIsFirst (evt, vertical, sortable) {
    var rect = getRect(getChild(sortable.el, 0, sortable.options, true));
    var spacer = 10;
    return vertical ? evt.clientX < rect.left - spacer || evt.clientY < rect.top && evt.clientX < rect.right : evt.clientY < rect.top - spacer || evt.clientY < rect.bottom && evt.clientX < rect.left;
}

function _ghostIsLast (evt, vertical, sortable) {
    var rect = getRect(lastChild(sortable.el, sortable.options.draggable));
    var spacer = 10;
    return vertical ? evt.clientX > rect.right + spacer || evt.clientX <= rect.right && evt.clientY > rect.bottom && evt.clientX >= rect.left : evt.clientX > rect.right && evt.clientY > rect.top || evt.clientX <= rect.right && evt.clientY > rect.bottom + spacer;
}

function _getSwapDirection (evt, target, targetRect, vertical, swapThreshold, invertedSwapThreshold, invertSwap, isLastTarget) {
    var mouseOnAxis = vertical ? evt.clientY : evt.clientX;
    var targetLength = vertical ? targetRect.height : targetRect.width;
    var targetS1 = vertical ? targetRect.top : targetRect.left;
    var targetS2 = vertical ? targetRect.bottom : targetRect.right;
    var invert = false;

    if (!invertSwap) {
        // Never invert or create dragEl shadow when target movemenet causes mouse to move past the end of regular swapThreshold
        if (isLastTarget && targetMoveDistance < targetLength * swapThreshold) {
            // multiplied only by swapThreshold because mouse will already be inside target by (1 - threshold) * targetLength / 2
            // check if past first invert threshold on side opposite of lastDirection
            if (!pastFirstInvertThresh && (lastDirection === 1 ? mouseOnAxis > targetS1 + targetLength * invertedSwapThreshold / 2 : mouseOnAxis < targetS2 - targetLength * invertedSwapThreshold / 2)) {
                // past first invert threshold, do not restrict inverted threshold to dragEl shadow
                pastFirstInvertThresh = true;
            }

            if (!pastFirstInvertThresh) {
                // dragEl shadow (target move distance shadow)
                if (lastDirection === 1 ? mouseOnAxis < targetS1 + targetMoveDistance // over dragEl shadow
                    : mouseOnAxis > targetS2 - targetMoveDistance) {
                    return -lastDirection;
                }
            } else {
                invert = true;
            }
        } else {
            // Regular
            if (mouseOnAxis > targetS1 + targetLength * (1 - swapThreshold) / 2 && mouseOnAxis < targetS2 - targetLength * (1 - swapThreshold) / 2) {
                return _getInsertDirection(target);
            }
        }
    }

    invert = invert || invertSwap;

    if (invert) {
        // Invert of regular
        if (mouseOnAxis < targetS1 + targetLength * invertedSwapThreshold / 2 || mouseOnAxis > targetS2 - targetLength * invertedSwapThreshold / 2) {
            return mouseOnAxis > targetS1 + targetLength / 2 ? 1 : -1;
        }
    }

    return 0;
}
/**
 * Gets the direction dragEl must be swapped relative to target in order to make it
 * seem that dragEl has been "inserted" into that element's position
 * @param  {HTMLElement} target       The target whose position dragEl is being inserted at
 * @return {Number}                   Direction dragEl must be swapped
 */

function _getInsertDirection (target) {
    if (index(dragEl) < index(target)) {
        return 1;
    } else {
        return -1;
    }
}
/**
 * Generate id
 * @param   {HTMLElement} el
 * @returns {String}
 * @private
 */

function _generateId (el) {
    var str = el.tagName + el.className + el.src + el.href + el.textContent;
    var i = str.length;
    var sum = 0;

    while (i--) {
        sum += str.charCodeAt(i);
    }

    return sum.toString(36);
}

function _saveInputCheckedState (root) {
    savedInputChecked.length = 0;
    var inputs = root.getElementsByTagName('input');
    var idx = inputs.length;

    while (idx--) {
        var el = inputs[idx];
        el.checked && savedInputChecked.push(el);
    }
}

function _nextTick (fn) {
    return setTimeout(fn, 0);
}

function _cancelNextTick (id) {
    return clearTimeout(id);
} // Fixed #973:

if (documentExists) {
    on(document, 'touchmove', function (evt) {
        if ((Sortable.active || awaitingDragStarted) && evt.cancelable) {
            evt.preventDefault();
        }
    });
} // Export utils

Sortable.utils = {
    on: on,
    off: off,
    css: css,
    find: find,
    is: function is (el, selector) {
        return !!closest(el, selector, el, false);
    },
    extend: extend,
    throttle: throttle,
    closest: closest,
    toggleClass: toggleClass,
    clone: clone,
    index: index,
    nextTick: _nextTick,
    cancelNextTick: _cancelNextTick,
    detectDirection: _detectDirection,
    getChild: getChild
};
/**
 * Get the Sortable instance of an element
 * @param  {HTMLElement} element The element
 * @return {Sortable|undefined}         The instance of Sortable
 */

Sortable.get = function (element) {
    return element[expando];
};
/**
 * Mount a plugin to Sortable
 * @param  {...SortablePlugin|SortablePlugin[]} plugins       Plugins being mounted
 */

Sortable.mount = function () {
    for (var _len = arguments.length, plugins = new Array(_len), _key = 0; _key < _len; _key++) {
        plugins[_key] = arguments[_key];
    }

    if (plugins[0].constructor === Array) { plugins = plugins[0]; }
    plugins.forEach(function (plugin) {
        if (!plugin.prototype || !plugin.prototype.constructor) {
            throw 'Sortable: Mounted plugin must be a constructor function, not '.concat({}.toString.call(plugin));
        }

        if (plugin.utils) { Sortable.utils = _objectSpread2(_objectSpread2({}, Sortable.utils), plugin.utils); }
        PluginManager.mount(plugin);
    });
};
/**
 * Create sortable instance
 * @param {HTMLElement}  el
 * @param {Object}      [options]
 */

Sortable.create = function (el, options) {
    return new Sortable(el, options);
}; // Export

Sortable.version = version;

var autoScrolls = [];
var scrollEl;
var scrollRootEl;
var scrolling = false;
var lastAutoScrollX;
var lastAutoScrollY;
var touchEvt$1;
var pointerElemChangedInterval;

function AutoScrollPlugin () {
    function AutoScroll () {
        this.defaults = {
            scroll: true,
            forceAutoScrollFallback: false,
            scrollSensitivity: 30,
            scrollSpeed: 10,
            bubbleScroll: true
        }; // Bind all private methods

        for (var fn in this) {
            if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
                this[fn] = this[fn].bind(this);
            }
        }
    }

    AutoScroll.prototype = {
        dragStarted: function dragStarted (_ref) {
            var originalEvent = _ref.originalEvent;

            if (this.sortable.nativeDraggable) {
                on(document, 'dragover', this._handleAutoScroll);
            } else {
                if (this.options.supportPointer) {
                    on(document, 'pointermove', this._handleFallbackAutoScroll);
                } else if (originalEvent.touches) {
                    on(document, 'touchmove', this._handleFallbackAutoScroll);
                } else {
                    on(document, 'mousemove', this._handleFallbackAutoScroll);
                }
            }
        },
        dragOverCompleted: function dragOverCompleted (_ref2) {
            var originalEvent = _ref2.originalEvent;

            // For when bubbling is canceled and using fallback (fallback 'touchmove' always reached)
            if (!this.options.dragOverBubble && !originalEvent.rootEl) {
                this._handleAutoScroll(originalEvent);
            }
        },
        drop: function drop () {
            if (this.sortable.nativeDraggable) {
                off(document, 'dragover', this._handleAutoScroll);
            } else {
                off(document, 'pointermove', this._handleFallbackAutoScroll);
                off(document, 'touchmove', this._handleFallbackAutoScroll);
                off(document, 'mousemove', this._handleFallbackAutoScroll);
            }

            clearPointerElemChangedInterval();
            clearAutoScrolls();
            cancelThrottle();
        },
        nulling: function nulling () {
            touchEvt$1 = scrollRootEl = scrollEl = scrolling = pointerElemChangedInterval = lastAutoScrollX = lastAutoScrollY = null;
            autoScrolls.length = 0;
        },
        _handleFallbackAutoScroll: function _handleFallbackAutoScroll (evt) {
            this._handleAutoScroll(evt, true);
        },
        _handleAutoScroll: function _handleAutoScroll (evt, fallback) {
            var _this = this;

            var x = (evt.touches ? evt.touches[0] : evt).clientX;
            var y = (evt.touches ? evt.touches[0] : evt).clientY;
            var elem = document.elementFromPoint(x, y);
            touchEvt$1 = evt; // IE does not seem to have native autoscroll,
            // Edge's autoscroll seems too conditional,
            // MACOS Safari does not have autoscroll,
            // Firefox and Chrome are good

            if (fallback || this.options.forceAutoScrollFallback || Edge || IE11OrLess || Safari) {
                autoScroll(evt, this.options, elem, fallback); // Listener for pointer element change

                var ogElemScroller = getParentAutoScrollElement(elem, true);

                if (scrolling && (!pointerElemChangedInterval || x !== lastAutoScrollX || y !== lastAutoScrollY)) {
                    pointerElemChangedInterval && clearPointerElemChangedInterval(); // Detect for pointer elem change, emulating native DnD behaviour

                    pointerElemChangedInterval = setInterval(function () {
                        var newElem = getParentAutoScrollElement(document.elementFromPoint(x, y), true);

                        if (newElem !== ogElemScroller) {
                            ogElemScroller = newElem;
                            clearAutoScrolls();
                        }

                        autoScroll(evt, _this.options, newElem, fallback);
                    }, 10);
                    lastAutoScrollX = x;
                    lastAutoScrollY = y;
                }
            } else {
                // if DnD is enabled (and browser has good autoscrolling), first autoscroll will already scroll, so get parent autoscroll of first autoscroll
                if (!this.options.bubbleScroll || getParentAutoScrollElement(elem, true) === getWindowScrollingElement()) {
                    clearAutoScrolls();
                    return;
                }

                autoScroll(evt, this.options, getParentAutoScrollElement(elem, false), false);
            }
        }
    };
    return _extends(AutoScroll, {
        pluginName: 'scroll',
        initializeByDefault: true
    });
}

function clearAutoScrolls () {
    autoScrolls.forEach(function (autoScroll) {
        clearInterval(autoScroll.pid);
    });
    autoScrolls = [];
}

function clearPointerElemChangedInterval () {
    clearInterval(pointerElemChangedInterval);
}

var autoScroll = throttle(function (evt, options, rootEl, isFallback) {
    // Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
    if (!options.scroll) { return; }
    var x = (evt.touches ? evt.touches[0] : evt).clientX;
    var y = (evt.touches ? evt.touches[0] : evt).clientY;
    var sens = options.scrollSensitivity;
    var speed = options.scrollSpeed;
    var winScroller = getWindowScrollingElement();
    var scrollThisInstance = false;
    var scrollCustomFn; // New scroll root, set scrollEl

    if (scrollRootEl !== rootEl) {
        scrollRootEl = rootEl;
        clearAutoScrolls();
        scrollEl = options.scroll;
        scrollCustomFn = options.scrollFn;

        if (scrollEl === true) {
            scrollEl = getParentAutoScrollElement(rootEl, true);
        }
    }

    var layersOut = 0;
    var currentParent = scrollEl;

    do {
        var el = currentParent;
        var rect = getRect(el);
        var top = rect.top;
        var bottom = rect.bottom;
        var left = rect.left;
        var right = rect.right;
        var width = rect.width;
        var height = rect.height;
        var canScrollX = void 0;
        var canScrollY = void 0;
        var scrollWidth = el.scrollWidth;
        var scrollHeight = el.scrollHeight;
        var elCSS = css(el);
        var scrollPosX = el.scrollLeft;
        var scrollPosY = el.scrollTop;

        if (el === winScroller) {
            canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll' || elCSS.overflowX === 'visible');
            canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll' || elCSS.overflowY === 'visible');
        } else {
            canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll');
            canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll');
        }

        var vx = canScrollX && (Math.abs(right - x) <= sens && scrollPosX + width < scrollWidth) - (Math.abs(left - x) <= sens && !!scrollPosX);
        var vy = canScrollY && (Math.abs(bottom - y) <= sens && scrollPosY + height < scrollHeight) - (Math.abs(top - y) <= sens && !!scrollPosY);

        if (!autoScrolls[layersOut]) {
            for (var i = 0; i <= layersOut; i++) {
                if (!autoScrolls[i]) {
                    autoScrolls[i] = {};
                }
            }
        }

        if (autoScrolls[layersOut].vx != vx || autoScrolls[layersOut].vy != vy || autoScrolls[layersOut].el !== el) {
            autoScrolls[layersOut].el = el;
            autoScrolls[layersOut].vx = vx;
            autoScrolls[layersOut].vy = vy;
            clearInterval(autoScrolls[layersOut].pid);

            if (vx != 0 || vy != 0) {
                scrollThisInstance = true;
                /* jshint loopfunc:true */

                autoScrolls[layersOut].pid = setInterval(function () {
                    // emulate drag over during autoscroll (fallback), emulating native DnD behaviour
                    if (isFallback && this.layer === 0) {
                        Sortable.active._onTouchMove(touchEvt$1); // To move ghost if it is positioned absolutely
                    }

                    var scrollOffsetY = autoScrolls[this.layer].vy ? autoScrolls[this.layer].vy * speed : 0;
                    var scrollOffsetX = autoScrolls[this.layer].vx ? autoScrolls[this.layer].vx * speed : 0;

                    if (typeof scrollCustomFn === 'function') {
                        if (scrollCustomFn.call(Sortable.dragged.parentNode[expando], scrollOffsetX, scrollOffsetY, evt, touchEvt$1, autoScrolls[this.layer].el) !== 'continue') {
                            return;
                        }
                    }

                    scrollBy(autoScrolls[this.layer].el, scrollOffsetX, scrollOffsetY);
                }.bind({
                    layer: layersOut
                }), 24);
            }
        }

        layersOut++;
    } while (options.bubbleScroll && currentParent !== winScroller && (currentParent = getParentAutoScrollElement(currentParent, false)));

    scrolling = scrollThisInstance; // in case another function catches scrolling as false in between when it is not
}, 30);

var drop = function drop (_ref) {
    var originalEvent = _ref.originalEvent;
    var putSortable = _ref.putSortable;
    var dragEl = _ref.dragEl;
    var activeSortable = _ref.activeSortable;
    var dispatchSortableEvent = _ref.dispatchSortableEvent;
    var hideGhostForTarget = _ref.hideGhostForTarget;
    var unhideGhostForTarget = _ref.unhideGhostForTarget;
    if (!originalEvent) { return; }
    var toSortable = putSortable || activeSortable;
    hideGhostForTarget();
    var touch = originalEvent.changedTouches && originalEvent.changedTouches.length ? originalEvent.changedTouches[0] : originalEvent;
    var target = document.elementFromPoint(touch.clientX, touch.clientY);
    unhideGhostForTarget();

    if (toSortable && !toSortable.el.contains(target)) {
        dispatchSortableEvent('spill');
        this.onSpill({
            dragEl: dragEl,
            putSortable: putSortable
        });
    }
};

function Revert () {}

Revert.prototype = {
    startIndex: null,
    dragStart: function dragStart (_ref2) {
        var oldDraggableIndex = _ref2.oldDraggableIndex;
        this.startIndex = oldDraggableIndex;
    },
    onSpill: function onSpill (_ref3) {
        var dragEl = _ref3.dragEl;
        var putSortable = _ref3.putSortable;
        this.sortable.captureAnimationState();

        if (putSortable) {
            putSortable.captureAnimationState();
        }

        var nextSibling = getChild(this.sortable.el, this.startIndex, this.options);

        if (nextSibling) {
            this.sortable.el.insertBefore(dragEl, nextSibling);
        } else {
            this.sortable.el.appendChild(dragEl);
        }

        this.sortable.animateAll();

        if (putSortable) {
            putSortable.animateAll();
        }
    },
    drop: drop
};

_extends(Revert, {
    pluginName: 'revertOnSpill'
});

function Remove () {}

Remove.prototype = {
    onSpill: function onSpill (_ref4) {
        var dragEl = _ref4.dragEl;
        var putSortable = _ref4.putSortable;
        var parentSortable = putSortable || this.sortable;
        parentSortable.captureAnimationState();
        dragEl.parentNode && dragEl.parentNode.removeChild(dragEl);
        parentSortable.animateAll();
    },
    drop: drop
};

_extends(Remove, {
    pluginName: 'removeOnSpill'
});

var lastSwapEl;

function SwapPlugin () {
    function Swap () {
        this.defaults = {
            swapClass: 'sortable-swap-highlight'
        };
    }

    Swap.prototype = {
        dragStart: function dragStart (_ref) {
            var dragEl = _ref.dragEl;
            lastSwapEl = dragEl;
        },
        dragOverValid: function dragOverValid (_ref2) {
            var completed = _ref2.completed;
            var target = _ref2.target;
            var onMove = _ref2.onMove;
            var activeSortable = _ref2.activeSortable;
            var changed = _ref2.changed;
            var cancel = _ref2.cancel;
            if (!activeSortable.options.swap) { return; }
            var el = this.sortable.el;
            var options = this.options;

            if (target && target !== el) {
                var prevSwapEl = lastSwapEl;

                if (onMove(target) !== false) {
                    toggleClass(target, options.swapClass, true);
                    lastSwapEl = target;
                } else {
                    lastSwapEl = null;
                }

                if (prevSwapEl && prevSwapEl !== lastSwapEl) {
                    toggleClass(prevSwapEl, options.swapClass, false);
                }
            }

            changed();
            completed(true);
            cancel();
        },
        drop: function drop (_ref3) {
            var activeSortable = _ref3.activeSortable;
            var putSortable = _ref3.putSortable;
            var dragEl = _ref3.dragEl;
            var toSortable = putSortable || this.sortable;
            var options = this.options;
            lastSwapEl && toggleClass(lastSwapEl, options.swapClass, false);

            if (lastSwapEl && (options.swap || putSortable && putSortable.options.swap)) {
                if (dragEl !== lastSwapEl) {
                    toSortable.captureAnimationState();
                    if (toSortable !== activeSortable) { activeSortable.captureAnimationState(); }
                    swapNodes(dragEl, lastSwapEl);
                    toSortable.animateAll();
                    if (toSortable !== activeSortable) { activeSortable.animateAll(); }
                }
            }
        },
        nulling: function nulling () {
            lastSwapEl = null;
        }
    };
    return _extends(Swap, {
        pluginName: 'swap',
        eventProperties: function eventProperties () {
            return {
                swapItem: lastSwapEl
            };
        }
    });
}

function swapNodes (n1, n2) {
    var p1 = n1.parentNode;
    var p2 = n2.parentNode;
    var i1;
    var i2;
    if (!p1 || !p2 || p1.isEqualNode(n2) || p2.isEqualNode(n1)) { return; }
    i1 = index(n1);
    i2 = index(n2);

    if (p1.isEqualNode(p2) && i1 < i2) {
        i2++;
    }

    p1.insertBefore(n2, p1.children[i1]);
    p2.insertBefore(n1, p2.children[i2]);
}

var multiDragElements = [];
var multiDragClones = [];
var lastMultiDragSelect;
// for selection with modifier key down (SHIFT)
var multiDragSortable;
var initialFolding = false;
// Initial multi-drag fold when drag started
var folding = false;
// Folding any other time
var dragStarted = false;
var dragEl$1;
var clonesFromRect;
var clonesHidden;

function MultiDragPlugin () {
    function MultiDrag (sortable) {
        // Bind all private methods
        for (var fn in this) {
            if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
                this[fn] = this[fn].bind(this);
            }
        }

        if (sortable.options.supportPointer) {
            on(document, 'pointerup', this._deselectMultiDrag);
        } else {
            // on(document, 'mouseup', this._deselectMultiDrag);
            on(document, 'touchend', this._deselectMultiDrag);
        }

        on(document, 'keydown', this._checkKeyDown);
        on(document, 'keyup', this._checkKeyUp);
        this.defaults = {
            selectedClass: 'sortable-selected',
            multiDragKey: null,
            setData: function setData (dataTransfer, dragEl) {
                var data = '';

                if (multiDragElements.length && multiDragSortable === sortable) {
                    multiDragElements.forEach(function (multiDragElement, i) {
                        data += (!i ? '' : ', ') + multiDragElement.textContent;
                    });
                } else {
                    data = dragEl.textContent;
                }

                dataTransfer.setData('Text', data);
            }
        };
    }

    MultiDrag.prototype = {
        multiDragKeyDown: false,
        isMultiDrag: false,
        delayStartGlobal: function delayStartGlobal (_ref) {
            var dragged = _ref.dragEl;
            dragEl$1 = dragged;
        },
        delayEnded: function delayEnded () {
            this.isMultiDrag = ~multiDragElements.indexOf(dragEl$1);
        },
        setupClone: function setupClone (_ref2) {
            var sortable = _ref2.sortable;
            var cancel = _ref2.cancel;
            if (!this.isMultiDrag) { return; }

            for (var i = 0; i < multiDragElements.length; i++) {
                multiDragClones.push(clone(multiDragElements[i]));
                multiDragClones[i].sortableIndex = multiDragElements[i].sortableIndex;
                multiDragClones[i].draggable = false;
                multiDragClones[i].style['will-change'] = '';
                toggleClass(multiDragClones[i], this.options.selectedClass, false);
                multiDragElements[i] === dragEl$1 && toggleClass(multiDragClones[i], this.options.chosenClass, false);
            }

            sortable._hideClone();

            cancel();
        },
        clone: function clone (_ref3) {
            var sortable = _ref3.sortable;
            var rootEl = _ref3.rootEl;
            var dispatchSortableEvent = _ref3.dispatchSortableEvent;
            var cancel = _ref3.cancel;
            if (!this.isMultiDrag) { return; }

            if (!this.options.removeCloneOnHide) {
                if (multiDragElements.length && multiDragSortable === sortable) {
                    insertMultiDragClones(true, rootEl);
                    dispatchSortableEvent('clone');
                    cancel();
                }
            }
        },
        showClone: function showClone (_ref4) {
            var cloneNowShown = _ref4.cloneNowShown;
            var rootEl = _ref4.rootEl;
            var cancel = _ref4.cancel;
            if (!this.isMultiDrag) { return; }
            insertMultiDragClones(false, rootEl);
            multiDragClones.forEach(function (clone) {
                css(clone, 'display', '');
            });
            cloneNowShown();
            clonesHidden = false;
            cancel();
        },
        hideClone: function hideClone (_ref5) {
            var _this = this;

            var sortable = _ref5.sortable;
            var cloneNowHidden = _ref5.cloneNowHidden;
            var cancel = _ref5.cancel;
            if (!this.isMultiDrag) { return; }
            multiDragClones.forEach(function (clone) {
                css(clone, 'display', 'none');

                if (_this.options.removeCloneOnHide && clone.parentNode) {
                    clone.parentNode.removeChild(clone);
                }
            });
            cloneNowHidden();
            clonesHidden = true;
            cancel();
        },
        dragStartGlobal: function dragStartGlobal (_ref6) {
            var sortable = _ref6.sortable;

            if (!this.isMultiDrag && multiDragSortable) {
                multiDragSortable.multiDrag._deselectMultiDrag();
            }

            multiDragElements.forEach(function (multiDragElement) {
                multiDragElement.sortableIndex = index(multiDragElement);
            }); // Sort multi-drag elements

            multiDragElements = multiDragElements.sort(function (a, b) {
                return a.sortableIndex - b.sortableIndex;
            });
            dragStarted = true;
        },
        dragStarted: function dragStarted (_ref7) {
            var _this2 = this;

            var sortable = _ref7.sortable;
            if (!this.isMultiDrag) { return; }

            if (this.options.sort) {
                // Capture rects,
                // hide multi drag elements (by positioning them absolute),
                // set multi drag elements rects to dragRect,
                // show multi drag elements,
                // animate to rects,
                // unset rects & remove from DOM
                sortable.captureAnimationState();

                if (this.options.animation) {
                    multiDragElements.forEach(function (multiDragElement) {
                        if (multiDragElement === dragEl$1) { return; }
                        css(multiDragElement, 'position', 'absolute');
                    });
                    var dragRect = getRect(dragEl$1, false, true, true);
                    multiDragElements.forEach(function (multiDragElement) {
                        if (multiDragElement === dragEl$1) { return; }
                        setRect(multiDragElement, dragRect);
                    });
                    folding = true;
                    initialFolding = true;
                }
            }

            sortable.animateAll(function () {
                folding = false;
                initialFolding = false;

                if (_this2.options.animation) {
                    multiDragElements.forEach(function (multiDragElement) {
                        unsetRect(multiDragElement);
                    });
                } // Remove all auxiliary multidrag items from el, if sorting enabled

                if (_this2.options.sort) {
                    removeMultiDragElements();
                }
            });
        },
        dragOver: function dragOver (_ref8) {
            var target = _ref8.target;
            var completed = _ref8.completed;
            var cancel = _ref8.cancel;

            if (folding && ~multiDragElements.indexOf(target)) {
                completed(false);
                cancel();
            }
        },
        revert: function revert (_ref9) {
            var fromSortable = _ref9.fromSortable;
            var rootEl = _ref9.rootEl;
            var sortable = _ref9.sortable;
            var dragRect = _ref9.dragRect;

            if (multiDragElements.length > 1) {
                // Setup unfold animation
                multiDragElements.forEach(function (multiDragElement) {
                    sortable.addAnimationState({
                        target: multiDragElement,
                        rect: folding ? getRect(multiDragElement) : dragRect
                    });
                    unsetRect(multiDragElement);
                    multiDragElement.fromRect = dragRect;
                    fromSortable.removeAnimationState(multiDragElement);
                });
                folding = false;
                insertMultiDragElements(!this.options.removeCloneOnHide, rootEl);
            }
        },
        dragOverCompleted: function dragOverCompleted (_ref10) {
            var sortable = _ref10.sortable;
            var isOwner = _ref10.isOwner;
            var insertion = _ref10.insertion;
            var activeSortable = _ref10.activeSortable;
            var parentEl = _ref10.parentEl;
            var putSortable = _ref10.putSortable;
            var options = this.options;

            if (insertion) {
                // Clones must be hidden before folding animation to capture dragRectAbsolute properly
                if (isOwner) {
                    activeSortable._hideClone();
                }

                initialFolding = false; // If leaving sort:false root, or already folding - Fold to new location

                if (options.animation && multiDragElements.length > 1 && (folding || !isOwner && !activeSortable.options.sort && !putSortable)) {
                    // Fold: Set all multi drag elements's rects to dragEl's rect when multi-drag elements are invisible
                    var dragRectAbsolute = getRect(dragEl$1, false, true, true);
                    multiDragElements.forEach(function (multiDragElement) {
                        if (multiDragElement === dragEl$1) { return; }
                        setRect(multiDragElement, dragRectAbsolute); // Move element(s) to end of parentEl so that it does not interfere with multi-drag clones insertion if they are inserted
                        // while folding, and so that we can capture them again because old sortable will no longer be fromSortable

                        parentEl.appendChild(multiDragElement);
                    });
                    folding = true;
                } // Clones must be shown (and check to remove multi drags) after folding when interfering multiDragElements are moved out

                if (!isOwner) {
                    // Only remove if not folding (folding will remove them anyways)
                    if (!folding) {
                        removeMultiDragElements();
                    }

                    if (multiDragElements.length > 1) {
                        var clonesHiddenBefore = clonesHidden;

                        activeSortable._showClone(sortable); // Unfold animation for clones if showing from hidden

                        if (activeSortable.options.animation && !clonesHidden && clonesHiddenBefore) {
                            multiDragClones.forEach(function (clone) {
                                activeSortable.addAnimationState({
                                    target: clone,
                                    rect: clonesFromRect
                                });
                                clone.fromRect = clonesFromRect;
                                clone.thisAnimationDuration = null;
                            });
                        }
                    } else {
                        activeSortable._showClone(sortable);
                    }
                }
            }
        },
        dragOverAnimationCapture: function dragOverAnimationCapture (_ref11) {
            var dragRect = _ref11.dragRect;
            var isOwner = _ref11.isOwner;
            var activeSortable = _ref11.activeSortable;
            multiDragElements.forEach(function (multiDragElement) {
                multiDragElement.thisAnimationDuration = null;
            });

            if (activeSortable.options.animation && !isOwner && activeSortable.multiDrag.isMultiDrag) {
                clonesFromRect = _extends({}, dragRect);
                var dragMatrix = matrix(dragEl$1, true);
                clonesFromRect.top -= dragMatrix.f;
                clonesFromRect.left -= dragMatrix.e;
            }
        },
        dragOverAnimationComplete: function dragOverAnimationComplete () {
            if (folding) {
                folding = false;
                removeMultiDragElements();
            }
        },
        drop: function drop (_ref12) {
            var evt = _ref12.originalEvent;
            var rootEl = _ref12.rootEl;
            var parentEl = _ref12.parentEl;
            var sortable = _ref12.sortable;
            var dispatchSortableEvent = _ref12.dispatchSortableEvent;
            var oldIndex = _ref12.oldIndex;
            var putSortable = _ref12.putSortable;
            var toSortable = putSortable || this.sortable;
            if (!evt) { return; }
            var options = this.options;
            var children = parentEl.children; // Multi-drag selection

            if (!dragStarted) {
                if (options.multiDragKey && !this.multiDragKeyDown) {
                    this._deselectMultiDrag();
                }

                toggleClass(dragEl$1, options.selectedClass, !~multiDragElements.indexOf(dragEl$1));

                if (!~multiDragElements.indexOf(dragEl$1)) {
                    multiDragElements.push(dragEl$1);
                    dispatchEvent({
                        sortable: sortable,
                        rootEl: rootEl,
                        name: 'select',
                        targetEl: dragEl$1,
                        originalEvt: evt
                    }); // Modifier activated, select from last to dragEl

                    if (evt.shiftKey && lastMultiDragSelect && sortable.el.contains(lastMultiDragSelect)) {
                        var lastIndex = index(lastMultiDragSelect);
                        var currentIndex = index(dragEl$1);

                        if (~lastIndex && ~currentIndex && lastIndex !== currentIndex) {
                            // Must include lastMultiDragSelect (select it), in case modified selection from no selection
                            // (but previous selection existed)
                            var n, i;

                            if (currentIndex > lastIndex) {
                                i = lastIndex;
                                n = currentIndex;
                            } else {
                                i = currentIndex;
                                n = lastIndex + 1;
                            }

                            for (; i < n; i++) {
                                if (~multiDragElements.indexOf(children[i])) { continue; }
                                toggleClass(children[i], options.selectedClass, true);
                                multiDragElements.push(children[i]);
                                dispatchEvent({
                                    sortable: sortable,
                                    rootEl: rootEl,
                                    name: 'select',
                                    targetEl: children[i],
                                    originalEvt: evt
                                });
                            }
                        }
                    } else {
                        lastMultiDragSelect = dragEl$1;
                    }

                    multiDragSortable = toSortable;
                } else {
                    multiDragElements.splice(multiDragElements.indexOf(dragEl$1), 1);
                    lastMultiDragSelect = null;
                    dispatchEvent({
                        sortable: sortable,
                        rootEl: rootEl,
                        name: 'deselect',
                        targetEl: dragEl$1,
                        originalEvt: evt
                    });
                }
            } // Multi-drag drop

            if (dragStarted && this.isMultiDrag) {
                folding = false; // Do not "unfold" after around dragEl if reverted

                if ((parentEl[expando].options.sort || parentEl !== rootEl) && multiDragElements.length > 1) {
                    var dragRect = getRect(dragEl$1);
                    var multiDragIndex = index(dragEl$1, ':not(.' + this.options.selectedClass + ')');
                    if (!initialFolding && options.animation) { dragEl$1.thisAnimationDuration = null; }
                    toSortable.captureAnimationState();

                    if (!initialFolding) {
                        if (options.animation) {
                            dragEl$1.fromRect = dragRect;
                            multiDragElements.forEach(function (multiDragElement) {
                                multiDragElement.thisAnimationDuration = null;

                                if (multiDragElement !== dragEl$1) {
                                    var rect = folding ? getRect(multiDragElement) : dragRect;
                                    multiDragElement.fromRect = rect; // Prepare unfold animation

                                    toSortable.addAnimationState({
                                        target: multiDragElement,
                                        rect: rect
                                    });
                                }
                            });
                        } // Multi drag elements are not necessarily removed from the DOM on drop, so to reinsert
                        // properly they must all be removed

                        removeMultiDragElements();
                        multiDragElements.forEach(function (multiDragElement) {
                            if (children[multiDragIndex]) {
                                parentEl.insertBefore(multiDragElement, children[multiDragIndex]);
                            } else {
                                parentEl.appendChild(multiDragElement);
                            }

                            multiDragIndex++;
                        }); // If initial folding is done, the elements may have changed position because they are now
                        // unfolding around dragEl, even though dragEl may not have his index changed, so update event
                        // must be fired here as Sortable will not.

                        if (oldIndex === index(dragEl$1)) {
                            var update = false;
                            multiDragElements.forEach(function (multiDragElement) {
                                if (multiDragElement.sortableIndex !== index(multiDragElement)) {
                                    update = true;
                                }
                            });

                            if (update) {
                                dispatchSortableEvent('update');
                            }
                        }
                    } // Must be done after capturing individual rects (scroll bar)

                    multiDragElements.forEach(function (multiDragElement) {
                        unsetRect(multiDragElement);
                    });
                    toSortable.animateAll();
                }

                multiDragSortable = toSortable;
            } // Remove clones if necessary

            if (rootEl === parentEl || putSortable && putSortable.lastPutMode !== 'clone') {
                multiDragClones.forEach(function (clone) {
                    clone.parentNode && clone.parentNode.removeChild(clone);
                });
            }
        },
        nullingGlobal: function nullingGlobal () {
            this.isMultiDrag = dragStarted = false;
            multiDragClones.length = 0;
        },
        destroyGlobal: function destroyGlobal () {
            this._deselectMultiDrag();

            off(document, 'pointerup', this._deselectMultiDrag);
            off(document, 'mouseup', this._deselectMultiDrag);
            off(document, 'touchend', this._deselectMultiDrag);
            off(document, 'keydown', this._checkKeyDown);
            off(document, 'keyup', this._checkKeyUp);
        },
        _deselectMultiDrag: function _deselectMultiDrag (evt) {
            if (typeof dragStarted !== 'undefined' && dragStarted) { return; } // Only deselect if selection is in this sortable

            if (multiDragSortable !== this.sortable) { return; } // Only deselect if target is not item in this sortable

            if (evt && closest(evt.target, this.options.draggable, this.sortable.el, false)) { return; } // Only deselect if left click

            if (evt && evt.button !== 0) { return; }

            while (multiDragElements.length) {
                var el = multiDragElements[0];
                toggleClass(el, this.options.selectedClass, false);
                multiDragElements.shift();
                dispatchEvent({
                    sortable: this.sortable,
                    rootEl: this.sortable.el,
                    name: 'deselect',
                    targetEl: el,
                    originalEvt: evt
                });
            }
        },
        _checkKeyDown: function _checkKeyDown (evt) {
            if (evt.key === this.options.multiDragKey) {
                this.multiDragKeyDown = true;
            }
        },
        _checkKeyUp: function _checkKeyUp (evt) {
            if (evt.key === this.options.multiDragKey) {
                this.multiDragKeyDown = false;
            }
        }
    };
    return _extends(MultiDrag, {
        // Static methods & properties
        pluginName: 'multiDrag',
        utils: {
            /**
             * Selects the provided multi-drag item
             * @param  {HTMLElement} el    The element to be selected
             */
            select: function select (el) {
                var sortable = el.parentNode[expando];
                if (!sortable || !sortable.options.multiDrag || ~multiDragElements.indexOf(el)) { return; }

                if (multiDragSortable && multiDragSortable !== sortable) {
                    multiDragSortable.multiDrag._deselectMultiDrag();

                    multiDragSortable = sortable;
                }

                toggleClass(el, sortable.options.selectedClass, true);
                multiDragElements.push(el);
            },

            /**
             * Deselects the provided multi-drag item
             * @param  {HTMLElement} el    The element to be deselected
             */
            deselect: function deselect (el) {
                var sortable = el.parentNode[expando];
                var index = multiDragElements.indexOf(el);
                if (!sortable || !sortable.options.multiDrag || !~index) { return; }
                toggleClass(el, sortable.options.selectedClass, false);
                multiDragElements.splice(index, 1);
            }
        },
        eventProperties: function eventProperties () {
            var _this3 = this;

            var oldIndicies = [];
            var newIndicies = [];
            multiDragElements.forEach(function (multiDragElement) {
                oldIndicies.push({
                    multiDragElement: multiDragElement,
                    index: multiDragElement.sortableIndex
                }); // multiDragElements will already be sorted if folding

                var newIndex;

                if (folding && multiDragElement !== dragEl$1) {
                    newIndex = -1;
                } else if (folding) {
                    newIndex = index(multiDragElement, ':not(.' + _this3.options.selectedClass + ')');
                } else {
                    newIndex = index(multiDragElement);
                }

                newIndicies.push({
                    multiDragElement: multiDragElement,
                    index: newIndex
                });
            });
            return {
                items: _toConsumableArray(multiDragElements),
                clones: [].concat(multiDragClones),
                oldIndicies: oldIndicies,
                newIndicies: newIndicies
            };
        },
        optionListeners: {
            multiDragKey: function multiDragKey (key) {
                key = key.toLowerCase();

                if (key === 'ctrl') {
                    key = 'Control';
                } else if (key.length > 1) {
                    key = key.charAt(0).toUpperCase() + key.substr(1);
                }

                return key;
            }
        }
    });
}

function insertMultiDragElements (clonesInserted, rootEl) {
    multiDragElements.forEach(function (multiDragElement, i) {
        var target = rootEl.children[multiDragElement.sortableIndex + (clonesInserted ? Number(i) : 0)];

        if (target) {
            rootEl.insertBefore(multiDragElement, target);
        } else {
            rootEl.appendChild(multiDragElement);
        }
    });
}
/**
 * Insert multi-drag clones
 * @param  {[Boolean]} elementsInserted  Whether the multi-drag elements are inserted
 * @param  {HTMLElement} rootEl
 */

function insertMultiDragClones (elementsInserted, rootEl) {
    multiDragClones.forEach(function (clone, i) {
        var target = rootEl.children[clone.sortableIndex + (elementsInserted ? Number(i) : 0)];

        if (target) {
            rootEl.insertBefore(clone, target);
        } else {
            rootEl.appendChild(clone);
        }
    });
}

function removeMultiDragElements () {
    multiDragElements.forEach(function (multiDragElement) {
        if (multiDragElement === dragEl$1) { return; }
        multiDragElement.parentNode && multiDragElement.parentNode.removeChild(multiDragElement);
    });
}

Sortable.mount(new AutoScrollPlugin());
Sortable.mount(Remove, Revert);

export default Sortable;
export { MultiDragPlugin as MultiDrag, Sortable, SwapPlugin as Swap };
